Seriously, if you are playing Troon on a visitor day (not with a member), I would think about skipping Troon and playing Prestwick and Western Gailes.
Troon can be very slow on a visitor day. Maybe things have improved in that respect. Not sure of your arrangement, but often the visitor gig at Troon includes golf and lunch and perhaps a round on the Portland. Obviously they 'include' a lunch in their price. The lunch is marvelous and Troon is very welcoming, but when you are 'over there', well, you are there to play golf. Of course, you can blow off the 'paid' scrumpous lunch and skip out to play elsewhere.
If you definitely have a whole day set aside for Troon, have a lunch and dilly dally in the clubhouse.