The total rostered flying you receive depends on many factors, unit cost (how much Ryanair pay brookfield for you services) base, seasonal requirements,training requirements, sickness, can you fly with a newly promoted captain, etc etc.
A new guy can expect 600 hours at this horrendous time for aviation, but that is just my opinion.
I will do at least 800 hours this year - but I am not a co-pilot.
Good luck, but be prepared to be totally alone with you worries.
Kudos to you chaps who stick it out with all that debt.