40,000 hour limit on the CRJ series. Don't know about cycles, and any hour extensions approved by FAA.

SkyWest has at least one (can't remember if it's 403SW, ser# 28 and first CRJ for Skywest, or 405SW, ser#29) had 38,000 hours more than a year ago.

Note: 404SW is a Cessna 172, which probably explains why sequential serial numbers are two numbers apart on their registration numbers.