At least so far anyway, I've never had a problem stringing up anything the next day. Heat treat, dry bending, and streaming. As soon as their cool I get then bending. Though because of my schedule, I usually end up hearing the bow either before work or before bed, so it sits a minimum of a day before I get back to it. Sometimes a couple if I'm busy from sunup to sundown for a few days.
The only problem I've ran into steaming is due to my method. Where I wrap the spot in a wet rag, wrap in foil, then boil wth a heat gun. If you don't seal the wood the water from the rag will soak in before it gets hot and will make LOTS of micro splits once you remove the foil and all the boiling/steaming moisture leaves at once.
Kyle