Go in
Pay the fee
Unzip the pants
Get it done
Race the 15 min clock to the 'finish' line.
Zip up the pants
Leave
.... no feelings, no pillow talk, no connection, no shower or prep-time, no thinking, just 'blort' and go....
Keep in mind 15 min providers are high-volume providers, most of the time.... and high-volume tend to be from low-quality providers.... and low-quality providers tend to work the 'wrong side of the tracks'...so mind your surroundings.
Only exception to the rule, in my experience, is from good quality providers with an established clientele of regulars who don't mind you as a loyal customer to drop by for a quickie during their morning commute to work.