From Handle Animal of the SRD (my emphasis:
I would say it takes six weeksb at DC 18 (3 hours per day per cub). It says that you can teach tricks at the same time. Maybe the PHB description is more complete.For tasks with specific time frames noted above, you must spend half this time (at the rate of 3 hours per day per animal being handled) working toward completion of the task before you attempt the Handle Animal check. If the check fails, your attempt to teach, rear, or train the animal fails and you need not complete the teaching, rearing, or training time. If the check succeeds, you must invest the remainder of the time to complete the teaching, rearing, or training. If the time is interrupted or the task is not followed through to completion, the attempt to teach, rear, or train the animal automatically fails.
Try Again
Yes, except for rearing an animal.