I'd suggest those who don't think its possible to have less than 30 hours a month to look at UK base rosters at the moment. 20 is common in some for November. Some are lucky to get a week out of base like TFS but if not you're screwed if you haven't saved in summer and have loan repayments.
Expect to hit 500hrs about 1 year after starting the rating if you're lucky enough to be line training in winter (if line training you'll do 70+hrs a month irrespective of the season). If you do line training in summer then I'd estimate up to 15 months from week 1 at EMA to hit 500.