Force Sensitive Archive

If you miss the sith or old man while riding on a swoop or something does he stay there or does he appear again later (i know its a noob question for FS but ive been having trouble looking it up at any other posts then my own so i need to know)

Anakin: What does that have to do with anything???
Yoda: Ev-ery-thing. Fear is the path to the Dark Side. Fear leads to anger, anger leads to hate, hate leads to suf-fur-ing... I sense much fear in you.

they will stay for a bit but will just respawn again in a few days if you missed them and dident go back for them...