Senses Spa Scheduling

Looking at trying to maybe fit in an evening massage at Senses at Grand Floridian after a longish part day in Magic Kingdom. Current theory is to leave right after the festival of fantasy parade. However, the posted closing hour at the spa is 6pm. Anyone know how that interacts with scheduling for them? Do they book appointments up until 6pm, or do they book appointments so that all services will be finished by 6pm?

I listened to this podcast a couple of weeks ago:

It talks about the senses spas. They say that SSR has longer hours.

Thanks, I’ll have to check it out.