Hey guys, check this link:
Ryanair sheds light on recruitment process at ATO symposium | Pilot Career News
According to this, they have around 1000 pilots coming in for assessments per year with a 48% pass rate.
Please note that this was posted in June 2014. However, that's also when the recruitment started to bloom up. I doubt there's more assessments than 1200 pilots, making it 150 assessments in max 3 days per week.
Anyone going to Dublin 7th of April for an assessment?