Many favors to consider in answering, however 30 minutes if man paces a bit. For me, longer

@sweetvia96 I’m am a much older man replying to you.
1st, let dad have some space and enjoy his new found friend.
2nd, has the word marriage been used? If not, use the time to get better acquainted with the girl. Many younger women truly want to be with older guys. If they do talk marriage, sit down to discuss with both of them, and be upfront & honest about your feelings.
Most of all, always support dad.
Good Luck to all!!

@sarah Silverman 52

Many favors to consider in answering, however 30 minutes if man paces a bit. For me, longer