Some females take more or less time if you think she is finished take the eggs and while you do so check if she has more in her, you obviously do not need to palpate for eggs as they are visible if present, if she is not finished put her back and come back later to see if she is done.
Waiting 2 more hours will not hurt the eggs either, I have collected eggs coming back from work before after they were laid early in the morning without any issue, I even found eggs 1 or 2 days later and they still were fine.