The answer is of course ‘it depends’. It depends on how much your body is ready for the training. The more years of training you have behind you, the more you can deal with. Ultimately, the only person who can decide whether you are training too much of little I you. Fortunately, your body is constantly giving you messages informing you of whether this is happening or not. Lets look at a few of them:
‘I am not getting stronger/fitter’ – This message means you are not training the attributes you wish to target hard enough.
‘I really have to force myself to do each session and I’m feeling tired, sore and unable to maintain a similar level of performance to previous sessions. – This message means you are doing more than your body can recover from. But before blaming too much training, first ask yourself if it’s the quality of your recovery that is actually to blame – too little sleep, too much additional life stress, poor diet, too much alcohol etc…
To start answering the question of ‘how much should I train?’, a good place to start is ‘try a bit more that you are used to’. Your body will tell you whether your choice is broadly correct or not. If its not enough training, you will stay at the same level. Too much and thing will hurt.
Another complicating factor that will confuse the messages coming your body (besides how well you take care of your body in recovery) is training choices you make. So if you train harder and harder than before and still nothing happens, you probably need to add some variety in the training.
Pulling on the same holds, on the same wall or crag week in, week out, for years is not training, it’s just going through the motions.
The bottom line is – listen to your body, if you really pay attention to it, it will give you almost all of the clues you need to choose the right workrate.