How long should I wait for a reply from guy in personals before I send another email??

Answer 1

if you're talking about an online dating site, you can tell when the last time they logged on was. If you send an email and it's been 2 days and they've been on since the email was sent, they may not want to respond. It won't hurt to send another just in case they don't get the first one. You never know with computers anymore.