I was in one if you have to wait 3 days then you know it's the beginning of the end. Because its just not a priority anymore
I say 24 hours and if they can't really get to you at least let you know that they've received it and will get back to you in X amount of time.
I know someone who has been waiting fro ages. I really feel for them. Its sad, but they're being realistic. Hope never dies.
around 2 days i suppose, depends if you know they're busy or not
thats a pretty long time when you're in a relationship, maybe message her again
That's depends on her....when I get mails,I always reply as fast as I can...