There is no time limit in the CDL, because it's a default. This can be found in your maintenance exposition manual as I said before, thus it depends on your company. Because the default differs from company and can be deviated from by the mechanic, it cannot be written in the CDL itself. It is a large time limit that offers planning/engineering dept plenty of time to plan it in sheduled maintenance checks.
And indeed the only possible restrictions you can see as mechanic are weight penalty or fuel burn.