If you mean that you got another line besides the control line but it took that long, I would retest. The Agdia tests can give a false positive if you press out too much "juice" from the leaf. You should only have the palest of pale green, not a dark green. Temperature can also play a part. Be sure you have followed the instructions to the letter.

I usually get results well within 5-10 minutes. When in doubt, I always retest. You can also contact Agdia. They are very helpful and professional with their customers.