Tests
grep -r 'BOOST_TEST.* < '
sometimes fails without details.
BOOST_THREAD_TEST_IT reports what the difference is.

Vim regex for replacement:
s/BOOST_TEST(\(.*\) < \(.*\))/BOOST_THREAD_TEST_IT(\1, \2)/

Working around multiple various msvc timeouts:

[00:10:06] testing.capture-output bin.v2\libs\thread\test\async__async_executor_p.test\msvc-14.1\rls\thrdp-wn32\thrd-mlt\async__async_executor_p.run
[00:10:06] ====== BEGIN OUTPUT ======
[00:10:06] libs\thread\test\sync\futures\async\async_executor_pass.cpp[168]
[00:10:06] libs\thread\test\sync\futures\async\async_executor_pass.cpp[161] 18700
[00:10:06] libs\thread\test\sync\futures\async\async_executor_pass.cpp[195]
[00:10:06] libs\thread\test\sync\futures\async\async_executor_pass.cpp[161] 1300
[00:10:06] libs\thread\test\sync\futures\async\async_executor_pass.cpp[222]
[00:10:06] libs\thread\test\sync\futures\async\async_executor_pass.cpp(160): test '(now - start).count() < (delay).count()' ('588712300' < '500000000') failed in function '__cdecl check_timer::~check_timer(void)'

[00:08:03] testing.capture-output bin.v2\libs\thread\test\async__async_executor_p.test\msvc-12.0\rls\thrdp-wn32\thrd-mlt\async__async_executor_p.run
[00:08:03] ====== BEGIN OUTPUT ======
[00:08:03] libs\thread\test\sync\futures\async\async_executor_pass.cpp[167]
[00:08:03] libs\thread\test\sync\futures\async\async_executor_pass.cpp(159): test 'now - start < delay' failed in function '__cdecl check_timer::~check_timer(void)'
[00:08:03] libs\thread\test\sync\futures\async\async_executor_pass.cpp[160] 671942300
[00:08:03] 1 error detected.

[00:11:18]    Creating library bin.v2\libs\thread\test\condition_variable_any__wait_for_pred_p.test\msvc-14.2\rls\thrdp-wn32\thrd-mlt\condition_variable_any__wait_for_pred_p.lib and object bin.v2\libs\thread\test\condition_variable_any__wait_for_pred_p.test\msvc-14.2\rls\thrdp-wn32\thrd-mlt\condition_variable_any__wait_for_pred_p.exp
[00:11:19] testing.capture-output bin.v2\libs\thread\test\condition_variable_any__wait_for_pred_p.test\msvc-14.2\rls\thrdp-wn32\thrd-mlt\condition_variable_any__wait_for_pred_p.run
[00:11:19] ====== BEGIN OUTPUT ======
[00:11:19] libs\thread\test\sync\conditions\condition_variable_any\wait_for_pred_pass.cpp(80): test '(d).count() < (ns(max_diff)).count()' ('359371700' < '350000000') failed in function 'void __cdecl f(void)'

[00:16:25] testing.capture-output bin.v2\libs\thread\test\sync_pq_single_thread_p_lib.test\msvc-12.0\rls\thrdp-wn32\thrd-mlt\sync_pq_single_thread_p_lib.run
[00:16:25] ====== BEGIN OUTPUT ======
[00:16:25] libs\thread\test\sync\mutual_exclusion\sync_pq\pq_single_thread_pass.cpp(72): test '(d).count() < (ns(max_diff)).count()' ('418238900' < '400000000') failed in function 'void __cdecl test_pull_until(void)'

fixup! increase and use BOOST_THREAD_TEST_TIME_MS

"g++"   -fvisibility-inlines-hidden -m32 -mthreads -O0 -fno-inline -Wall -g -fvisibility=hidden -march=i686 -Wextra -Wno-long-long -Wno-unused-parameter -Wno-variadic-macros -Wunused-function -pedantic -DBOOST_ALL_NO_LIB=1 -DBOOST_CHRONO_DYN_LINK=1 -DBOOST_THREAD_BUILD_DLL=1 -DBOOST_THREAD_THROW_IF_PRECONDITION_NOT_SATISFIED -DBOOST_THREAD_USE_DLL=1 -DBOOST_THREAD_WIN32  -I"."  -c -o "bin.v2\libs\thread\test\ex_executor.test\gcc-5\dbg\thrdp-wn32\thrd-mlt\vsblt-hdn\executor.o" "libs\thread\test\..\example\executor.cpp"
...failed gcc.compile.c++ bin.v2\libs\thread\test\ex_executor.test\gcc-5\dbg\thrdp-wn32\thrd-mlt\vsblt-hdn\executor.o...

https://ci.appveyor.com/project/pdimov/thread/builds/40207198/job/qu7mtpfr0lngi6ca