It depends really.If you've know the person for a while and you know stuff about them and you have thing's in common, well it can last a long time. If you have the opposite of that well it may last a while. (But what do I know) : P
Love can last forever. What most people don't realize is that love is a decision not just a feeling. Just as with anything important, worth while or successful, it takes work.
Well, it really depends on how hard he/she bit/sucked on your skin. Some can last as little as two days, but some can last weeks at a time! Mine last about 9 days :P
well ive got a lovebite/hickey...