MKMaggie,
No, you are not the only one who enjoys oral sex.
I would assume that about 22 hours after you last inserted one, the vast majority of it would be used up. I use a similar product (a prescription cream product here in Germany), and while I don't use mine every day, I make the executive decision (= that's a decision based on "because I need to have a life instead of debating the issue to death") that by 20 or 22 hours later it's safe enough for my husband to participate in the fun and activities in the vicinity.
Just my opinion. I couldn't find any info on the topic either. Perhaps a phone call or visit to a pharmacist might give you some more professional advice. You don't need to go into too much detail -- perhaps just phrase it generally, asking how long after insertion would it be safe for a male to be exposed to it. They've heard it all, I'm sure, and won't make any judgements or comments.
--Rheanna