I've been advised that demand is very high for Jedi Academy especially during school holidays when the parks are busy. I was told people start queuing very early, and I was advised to get into the park for 8.30am and hang around discoveryland, and keep an eye on the queue point for Jedi, and as soon as people start to gather, go and queue.
I haven't been to it personally but I asked 2 very experienced DLP people this exact question and that's what they told me.