[tools] Boost kcov timeouts (RobotLocomotion#22224)

tools/dynamic_analysis/bazel.rc

@@ -13,8 +13,10 @@ build:kcov --nocache_test_results
 # These increased timeouts were set through experimentation. Because kcov runs
 # in a separate process from the main program, the OS has to context-switch
 # between the processes every time a line is hit, slowing down execution
-# significantly. Timeouts are 10x default values.
-build:kcov --test_timeout=600,3000,9000,36000
+# significantly. In addition, kcov builds complete reports during the timeout
+# period, and is vulnerable to cloud filesystem slow-downs.  Timeouts are 20x
+# default values.
+build:kcov --test_timeout=1200,6000,19000,72000
 
 ### Kcov everything build. ###
 build:kcov_everything --build_tests_only
@@ -28,8 +30,8 @@ build:kcov_everything --run_under=//tools/dynamic_analysis:kcov
 build:kcov_everything --local_test_jobs=HOST_CPUS*0.5
 build:kcov_everything --test_tag_filters=-lint,-no_kcov
 build:kcov_everything --nocache_test_results
-# See timeout note above. Timeouts are 10x default values.
-build:kcov_everything --test_timeout=600,3000,9000,36000
+# See timeout note above.
+build:kcov_everything --test_timeout=1200,6000,19000,72000
 
 ### ASan build. Clang only. ###
 build:asan --build_tests_only