I plan to renew my tourist visa so I can stay legally as long as possible. If I renew my 90 day visa ahead of when the initial visa is set to expire, do I lose time on the inital 90 days? Or does 90 days get added to the first 90 days, giving me 180 days? I'm nervous about whether I'll get the renewal, but I need to plan ahead about where to stay, etc.