I would be picking it up on Wednesday as late as possible and dropping it Sunday night around 8pm
Yes you can drop it off and just put the keys in the key box
It depends on when and where you picked up, say you picked up at the airport at 8pm and dropped here at 8pm on Sunday it wouldn't add another day. But if you picked up at a branch like ours and returned on Sundaythe billing would go into Monday because of the 24 hour billing period.
Thanks! Your answer is awaiting moderation.