737 rated pilots should have a minimum of 100 hours on type.
Rank Type Hours Requirement Link
Captain B737 500+ hrs in command on type
Medium Jet 500+ hrs in command on type
First Officer B737 100+ hrs on type
JAR 25 aircraft 1,500 hrs on a JAR 25 aircraft
Cadet Fixed Wing 200 hrs
http://www.ryanair.com/site/EN/about...eers&ref=10002