How soon you let the tenant move in before the lease starts?

[Jenny Nguyen]

Hi,
I usually release the keys and do the walk through 1 day before the lease start and would ask for prorated rent if they want to move in earlier than 1 days? Just wonder how other Landlords do if tenants want to move in few days earlier? Do you charge them or not and do you have to modify the lease?
Thanks,