Quick question
 

Can the 1500 hours used to gain an unfrozen ATPL include private and other non-commercial flying, or does all of the 1500 hrs have to be commercial flying?

i believe so, as long as it is powered. frantic hand flapping cannot be logged!

Yes, it can include private flying, and in fact it can include any loggable time on aeroplanes, although I can't remember the exact rules re. non-aeroplane time.

There are a number of other requirements to be met, too. One of these is for 500 hours of multi-crew time. Although I don't think it's actually a requirement for this to be commercial, there aren't too many people are going to be able to get 500 hours of private multi-crew time ;)

FFF
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Thanks for ur answers so far.

So those 500 hours of multi - crew flying. Are those in addition to the 1500 hours or just part of them?

For the ATPL you must have 1500 hours total time, ofwhich 500 must be multi-crew. You must also have a certain minimum night and IFR time.