It's one of those great walks that can be as long or short a walk as you would like it to be. If you are feeling like doing a longish trek, then you might like to go for the whole four hour circular walk from the Archaeological Museum of La Zarza. If you are looking for a six hour trek, then you can extend the circular walk by continuing on down to Don Pedro. Ouch! It's quite a long way back up!!
However, if you are looking for something shorter, then just set off on the wooded trail and return the same way when you reach your pre-determined half-time point.