When we demo, normally only two or three kites (jeez big list there), let's say two like not long ago....we have 4 riders. One is on the beach kicking the dog, the rest station as you will, and one person on the main kite we all use...easy because we all use the same kite design...lol. About a 7-10 minute rotation. Hence after around 30-40 minutes, you have ridden all three and had a rest, rotate this through 3 times. Next day repeat, but extend each session to half an hour, so after 2 hours you have got a really good grip on what's going on. Third day pick ya poison and spend a real good session on it, even narrow the good ones down.
Problem is there is always one bugger who wants to hog the most popular kite on the water, so it's all good in theory!!
Demo days are real fun, give it a crack! Beers afterwards in theory, but some have been known to sneak one in on the rest station, and once while riding out...

oh sorry...I hear another safety post coming up...watch out...
Good luck my man, big damn list there.
Dave seeya in a couple of weeks.