didn't work, maybe I'm typing it in wrong. I tried it a number of ways:
varX = DLookup("[Begin]", "[Cycle Time]", "[TEST_REQUEST_NUMBER] = ")
varX = DLookup("[Begin]", "Cycle Time", "[TEST_REQUEST_NUMBER] = ")
= DLookup("[Begin]", "Cycle Time", "[TEST_REQUEST_NUMBER] = ")
=...