Why same-night use is the standard
Most households have nowhere else to put a bed, which means any method that requires a mattress to be out of service overnight is impractical regardless of how well it cleans. That constraint is designed into the process rather than treated as a compromise: controlled application, several recovery passes, and air movement across the surface before leaving. A technician who tells you the bed will be unusable until tomorrow is describing a method that is wrong for a mattress.