In FLA:

For Crits:
Cat 4/5 - 30-45 minutes
Cat 3 - 45-70 minutes
P12 - 60 - 80 minutes

For RR:
Cat 4/5 - 30-45 miles
Cat 3 - 40- 80 miles
P12 - 60 - 80 miles

Thats the ranges I've seen this year. Often the 3s are with the P12 for RRs and sometimes for crits or circuit races.