diff --git a/test/box/cfg.result b/test/box/cfg.result
index f4606addc73b8d955cdfe5c0c50532e4aca9f05b..70d3b766c3d30344a5c43ed9dfb03a714e25b872 100644
--- a/test/box/cfg.result
+++ b/test/box/cfg.result
@@ -638,7 +638,7 @@ test_run:cmd("start server cfg_tester6")
  | ---
  | - true
  | ...
-test_run:grep_log('cfg_tester6', 'set \'vinyl_memory\' configuration option to 1073741824', 1000)
+test_run:grep_log('cfg_tester6', 'set \'vinyl_memory\' configuration option to 1073741824')
  | ---
  | - set 'vinyl_memory' configuration option to 1073741824
  | ...
@@ -663,12 +663,12 @@ test_run:cmd("start server cfg_tester7")
  | - true
  | ...
 -- test there is replication log in log
-test_run:grep_log('cfg_tester7', 'set \'replication\' configuration option to', 1000)
+test_run:grep_log('cfg_tester7', 'set \'replication\' configuration option to')
  | ---
  | - set 'replication' configuration option to
  | ...
 -- test there is no password in log
-test_run:grep_log('cfg_tester7', 'test%-cluster%-cookie', 1000)
+test_run:grep_log('cfg_tester7', 'test%-cluster%-cookie')
  | ---
  | - null
  | ...
@@ -696,7 +696,7 @@ test_run:cmd("start server cfg_tester8")
 version_warning = "Please, consider using box.schema.upgrade()."
  | ---
  | ...
-test_run:wait_log('cfg_tester8', version_warning, 1000, 1.0) ~= nil
+test_run:wait_log('cfg_tester8', version_warning, nil, 1.0) ~= nil
  | ---
  | - true
  | ...
@@ -718,7 +718,7 @@ test_run:cmd("start server cfg_tester9")
  | - true
  | ...
 --- Check that the warning isn't printed.
-test_run:wait_log('cfg_tester9', version_warning, 1000, 1.0) == nil
+test_run:wait_log('cfg_tester9', version_warning, nil, 1.0) == nil
  | ---
  | - true
  | ...
diff --git a/test/box/cfg.test.lua b/test/box/cfg.test.lua
index 4d873e464aff101d8e4960b47c46c86dcd85ac1e..6342bb3df90a2688fca80e342d3e99fa08c2fc69 100644
--- a/test/box/cfg.test.lua
+++ b/test/box/cfg.test.lua
@@ -143,7 +143,7 @@ test_run:cmd("clear filter")
 --
 test_run:cmd('create server cfg_tester6 with script = "box/lua/cfg_test5.lua"')
 test_run:cmd("start server cfg_tester6")
-test_run:grep_log('cfg_tester6', 'set \'vinyl_memory\' configuration option to 1073741824', 1000)
+test_run:grep_log('cfg_tester6', 'set \'vinyl_memory\' configuration option to 1073741824')
 test_run:cmd("stop server cfg_tester6")
 test_run:cmd("cleanup server cfg_tester6")
 
@@ -153,9 +153,9 @@ test_run:cmd("cleanup server cfg_tester6")
 test_run:cmd('create server cfg_tester7 with script = "box/lua/cfg_test6.lua"')
 test_run:cmd("start server cfg_tester7")
 -- test there is replication log in log
-test_run:grep_log('cfg_tester7', 'set \'replication\' configuration option to', 1000)
+test_run:grep_log('cfg_tester7', 'set \'replication\' configuration option to')
 -- test there is no password in log
-test_run:grep_log('cfg_tester7', 'test%-cluster%-cookie', 1000)
+test_run:grep_log('cfg_tester7', 'test%-cluster%-cookie')
 test_run:cmd("stop server cfg_tester7")
 test_run:cmd("cleanup server cfg_tester7")
 
@@ -166,13 +166,13 @@ test_run:cmd('create server cfg_tester8 with script = "box/lua/cfg_test8.lua", w
 test_run:cmd("start server cfg_tester8")
 --- Check that the warning is printed.
 version_warning = "Please, consider using box.schema.upgrade()."
-test_run:wait_log('cfg_tester8', version_warning, 1000, 1.0) ~= nil
+test_run:wait_log('cfg_tester8', version_warning, nil, 1.0) ~= nil
 test_run:cmd("stop server cfg_tester8")
 test_run:cmd("cleanup server cfg_tester8")
 
 test_run:cmd('create server cfg_tester9 with script = "box/lua/cfg_test1.lua"')
 test_run:cmd("start server cfg_tester9")
 --- Check that the warning isn't printed.
-test_run:wait_log('cfg_tester9', version_warning, 1000, 1.0) == nil
+test_run:wait_log('cfg_tester9', version_warning, nil, 1.0) == nil
 test_run:cmd("stop server cfg_tester9")
 test_run:cmd("cleanup server cfg_tester9")
diff --git a/test/box/errinj.result b/test/box/errinj.result
index 7cf1d7a6393f71f134528d908689c001e7a3be0e..5a9323209a5457656c185c03d34945094dfc6add 100644
--- a/test/box/errinj.result
+++ b/test/box/errinj.result
@@ -1341,10 +1341,10 @@ log.info(string.rep('a', 1000))
 _ = fiber.create(long_poll)
 ---
 ...
-while not test_run:grep_log('default', 'can not allocate memory for a new message', 1000) do fiber.sleep(0.01) end
+while not test_run:grep_log('default', 'can not allocate memory for a new message') do fiber.sleep(0.01) end
 ---
 ...
-test_run:grep_log('default', 'stopping input on connection', 1000) ~= nil
+test_run:grep_log('default', 'stopping input on connection') ~= nil
 ---
 - true
 ...
diff --git a/test/box/errinj.test.lua b/test/box/errinj.test.lua
index 5e37b4da56829763941cba5de7dfa7d5491a67ce..ccbfa0369a1382e4b4dd4db2b54142fde98c283f 100644
--- a/test/box/errinj.test.lua
+++ b/test/box/errinj.test.lua
@@ -466,8 +466,8 @@ log = require('log')
 -- produced by a previous test.
 log.info(string.rep('a', 1000))
 _ = fiber.create(long_poll)
-while not test_run:grep_log('default', 'can not allocate memory for a new message', 1000) do fiber.sleep(0.01) end
-test_run:grep_log('default', 'stopping input on connection', 1000) ~= nil
+while not test_run:grep_log('default', 'can not allocate memory for a new message') do fiber.sleep(0.01) end
+test_run:grep_log('default', 'stopping input on connection') ~= nil
 started == 1
 continue = true
 errinj.set("ERRINJ_TESTING", false)
diff --git a/test/box/net.box_watcher.result b/test/box/net.box_watcher.result
index 078d2358ac9f43387f5705b5b2ff0fb60f360aec..baa2004b19e6478f9b00ca0db40c710b222cde06 100644
--- a/test/box/net.box_watcher.result
+++ b/test/box/net.box_watcher.result
@@ -180,7 +180,7 @@ w:unregister()
 w = conn:watch('foobar', function() error('foobar') end)
  | ---
  | ...
-test_run:wait_log('default', 'foobar', 1000)
+test_run:wait_log('default', 'foobar')
  | ---
  | - foobar
  | ...
diff --git a/test/box/net.box_watcher.test.lua b/test/box/net.box_watcher.test.lua
index 96cdb94842f65920a5eede6de6d3d15b8484572c..36c30c9a3c37ce4c21ae51d32dfa95009bf02400 100644
--- a/test/box/net.box_watcher.test.lua
+++ b/test/box/net.box_watcher.test.lua
@@ -62,7 +62,7 @@ w:unregister()
 
 -- Raising error from a callback.
 w = conn:watch('foobar', function() error('foobar') end)
-test_run:wait_log('default', 'foobar', 1000)
+test_run:wait_log('default', 'foobar')
 w:unregister()
 
 -- Broadcasting data that can't be encoded in msgpack.