Well, no not really the whole 'Jedifying' your party is totally up to you and you can do it whenever you please and turn them to whatever side you wish. But only few party members you can turn only
But make sure that you have significant Influence with them, about 75% I think, and of course their minimum level to become a jedi is, I think about 15 so by the time your up to your first planet they should be around that benchmark.
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Actually you can have 4 or 5 NPC's turned to jedi