Pitstops

I was thinking about make 1 or 2 stop strategy but I don\'t know how long it takes in each stop. So, ¿I will lose time doing pitstops?

Stop times vary per track as the pit entry and length vary per track.
As a rule of thumb I personally use around about 30s extra for a pitstop (including slower in- and outlap), but it\'s really a matter of building up knowledge from experience.

Thank you !