limo question

i live .5 mins from church
and ceremony begins at 2 pm

reception starts at 6.....

should i book the limo for 4 hrs? i'm confused....i guess i should ask my hall how early i can arrive first, right?

well more like 1.5 min lol
i dont think i could walk it...its not in the same block,
i was thinking about taking pics in the waterfront in jersey city

so from church
15 min drive... take pics

then 25 min drive to hall

how long do i book the limo for?