Does the Caulfield to Clayton shuttle bus get full easily ? And if any of you have used it , approx how long does it actually take ( website says 15-25 mins)? Cause I'm planning to use public transport till I get to Caulfield and then use the shuttle bus. Should I just use public transport completely ? Just trying to think ahead. Thank you 
During exam time, it definitely fills up easily, I think it's less than easily, but still annoyingly often, during semester? It'll take anywhere between 15-25 minutes (#soznotsoz) depending on the time of day.
But, if you're taking public transport to Caulfield, why not keep going on to Clayton...? Using PT, it'll usually only take 15 minutes to get from Caulfield to Clayton, and it's not going to cost you any extra at all. How exactly are you getting to Caulfield?