has not been used for too long, but..
1. u will be able to use the tubing for a long time, when it gets too dirty u have to clean it with steeel wool (I clean it once or twice a week, but not sure how clean it has to be to work) but it takes seconds to clean and will be as good as new. of course after a while the tubing will wear away until your left with nothing, but I imagine that won't happen for a long time.
2. latex tubing can be different, best to get an extra foot incase u need to cut off some fresh pieces of tubing for the ROP, cause it will get stretched and come off easier after a while, but as long as your not constantly taking the tubing off (u can clean it with the tubing on) it'll last, I'm going to say a month, rough estimate, maybhe less maybe more