Hi Anna, I'm not going to translate it, I'll tell you the common way
-How far is it?
Qué tan lejos está?
-Do we have enough time to eat?
Tenemos tiempo suficiente para comer?
-What time should we leave here?
A que hora debemos irnos de aqui?
-Could you wait for me please?
Podrías/Puedes esperarme por favor (Polite) Espérame por favor (Common)
-I'll be right back.
Vuelvo enseguida! / Ya vuelvo (Common)