I have to admit I never used that time delay feature. But according to OKO, it should work fine.
Try this: Create a new test mission just having the objects and triggers needed for that specific time delay thing. If it works, try to find out what you did or did not compared to your actual misson. If it doesn't, upload the file to a webserver like
http://rapidshare.de (free, no registration required) and I will have a look at it.
Another thing that just crossed my mind: If you set the first trigger to refire after t < 60s, then maybe the second trigger will not fire until the first one stopped refiring. (that could be wrong though, depends on implementation of TimeSinceTriggerRefired).