How long of a wait

Be sure to send it more than once and check-and-recheck the sendee's email address. The internet isn't rocket science but is IS fallible...

Steve not everyone checks mail every day & some are only online once a day, very early, very late etc. Unless you're in a big hurry & have found what you want elsewhere at a comparable price, I suggest waiting a day, or three.

I can't always check the e-mail box I use for this site every day and even then I have sometimes had problems with my e-mail software not sending replies promptly. Therefore, I think 24-48 hours would be a reasonable time period.

I agree with the above suggestions. If you haven't heard anything after 24 hours, send another email to confirm your interest and just to make sure that the message gets through. If you haven't heard anything after 3 days, consider it gone. You never know though, as i've had people get back to me up to two weeks later. Some people simply don't use the computer very often. Sean
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I'll echo the other responses and note that alot of folks take a business trip and need to wait to get emails when they get back home. Others may simply be on vacation or a long weekend somewhere.

Regards
Jim