I don't see many escort but with MA I usually like once at the beginning(mostly in shower). It release the tension(mine lol).
Then massage, oral,etc.
Then second shot.
jerk off a couple of hours before you go see an escort. as long as you can get it up you should last longer
Give it less time if you feel that amount of time is too long.
or if you think you can do 2 shots in an hour use the first shot for oral and the 2nd for sex
keep in mind your provider may not enjoy a half hour maraton