how many vials of blood do they take during bloodwork

i'm not on T yet, but was wondering because i'm really squeamish with needles and blood work. i'm trying to get over my fear, but last time i had bloodwork for something unrelated they ended up taking about 10 vials and i nearly passed out. i think i'd be fine if it's just 1-5 vials, but i want to know how long it takes and how much they take.