Your question is Deadline Decision Under Uncertainty. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Time is money. If a deadline was tomorrow, and you were 99% sure your program would work but thought it had a 1% chance of not working and you did not know why, would you push the deadline back?