It depends on so many things, Personally, I seem OK when it comes to spirits, but if I even sniff at a bottle of wine I am in hangover hell!! just cannot cope with wine at all.
Always best not to drink on any empty stomach, obviously, and alternate with water if you can! works for me (unless it is wine that is!)
If it was within an hour i'd feel tipsy... totally depends on how quickly the drinks were consumed. Mmm... mojitos are divine!
It depends upon the person, we have different alcohol tolerance levels. I'd probably feel a bit tipsy after that.