I'm a civil engineer, next day is fine. The loading from framework is nothing to worry about. Soil is about 5mpa and a slab poured with 25mpa would have about that after 24hrs. Don't stress I'd be happy if they framed up the day after pouring the slab
In most cases concrete dries in 24 hours. Its important to have reliable Seattle handyman who know what they are doing. Always check there references, insurance status, and if they are bonded.
