True that you have to keep the pressure on for the whole cure time, but the cure time for resin is only a couple minutes and much of that is consumed in the pouring the resin and loading it in the pressure chamber. So really the resin casting only spends about 3-5 minutes in the pressure chamber.
When it comes out I then put the mold in a warming chamber. It is two tin foil lasagna pans. I have a clamp on light fixture that shines a flood light through a hole in the top pan on one end. That's enough to heat the interior of the pans up to 100 degrees or so. The castings, still in the mold, go from the pressure tank into the warming chamber for 10 minutes or so to fully cure.
If I am making a couple different castings I alternate molds, preparing one while curing the other so it really doesn't add that much time to the overall process.
Being married to a dentist I got used to dental materials. My preferred casting media is finely ground clear acrylic and solvent. Make my molds out of rubber, fill with powdered acrylic, flood with solvent, add more plastic on top as needed and wait.
____________________ Junk is something you throw away three weeks before you need it.