Trica, there should be/have been instructions with the enlarging paper. Usually they are on a piece of paper in the box.(posted 8464 days ago)I recommend you develop RC paper for 1 minute, then stop and fix. The amount of fixing time depends on the paper fixer. For example, I fix my Ilford paper for only 30 seconds, as per their recommendations.
Fiber paper should probably be in the developer from 3 to 5 minutes, then stooped and fixed.
The thing is, RC is fully developed after 1 minute and then just gets darker all over. With fiber, the print develops up to about 5 minutes or so. Thus you have more control over the appearance of the print with fiber than with RC.
chris