How Long Will A Car Respray Take Please?

Hi all
I’m in the process of trying to find someone to respray the exterior panels of my car only. That is, sand, mask, prime and colour.
I will need to rent a car whilst mine is in the paint shop.
Therefore, to determine how long I will need to rent a car, can anybody estimate how long the painting would take please?
Assume, they did it start to finish without many interuptions. Just a rough estimate would be good so I can start working out the costs.
