I don't believe it...
In order to do a proper leak test in a shower pan the various manufactures require AT LEAST a 24-hour (and recommend up 72 hours) test... AFTER the pan has fully cured for a MINIMUM of 12 hours, most often 24 hours, and sometimes as long as 48 hours (again depending on the material/manufacturer) BEFORE you can even begin the leak test. I do not believe the vast majority of tile installers are really doing these tests as it's not practical for the working installer.
Assuming you are only installing a shower (and have no other work at the job site) this would mean a MINIMUM of two full work days of waiting around, ie. not working, for evey shower pan you build. This is not real-world stuff. No one can work like this and customers aren't going to be happy with no work being done for two-three days or longer.
Your honest thoughts and confessions?