Keep in mind that all the wash packages on the Tandem are programmable by the customer. The length of the wash will also depend on whether or not it has an integrated dryer. I have sites that are doing the basic wash in 2:45 and the top wash around 5:30.
So you can add another 60 seconds for the the drive thru dryer?
I am not taking any shots at anyone in particular but I am tired of manufacturers and some distributors claiming that a customer will load their car into an automatic while another is exiting through a free standing dryer. I have been at automatic locations from coast to coast and in very rare occasions does a customer even begin loading into an automatic while another is exiting through a free standing dryer. Normally they wait until the bay is completely cleared before entering.
I am not referring to the relatively new setup where the dryer pass is made in the area beyond the automatic in a separate space or bay. This set up seems to expedite the process a bit and does increase throughput somewhat but again, not as much as is often claimed.
While I would agree that a free standing dryer will improve throughput to a degree, the time gained by a free standing dryer is much less than many would have you believe. In reality what it saves is the time a dryer pass would take minus the time it takes a vehicle to exit the free standing dryer.