This has been happening consistently.

Here is the first commit where it timed out:
https://mci.10gen.com/ui/task/mongodb_mongo_master_windows_64_2k8_beaeb05efd7f70cb7885555be36d47b8beb2d2be_13_11_03_16_50_06_slow_weekly_tests_windows_64

Here is the commit directly before the one above. It actually fails in this commit, and then times out in subsequent commits:
https://mci.10gen.com/ui/task/mongodb_mongo_master_windows_64_2k8_83e056702108e7693e58886a8364aaa036eb6edd_13_11_03_00_09_05_slow_weekly_tests_windows_64

It also failed in this commit, a few back from the one above. This creates the possibility the test could be flaky:
https://mci.10gen.com/ui/task/mongodb_mongo_master_windows_64_2k8_50030f55d08d5ffe6a10e76542487b1b989e4972_13_11_01_21_45_06_slow_weekly_tests_windows_64