yes. i think someone else said that professionals really never tell you how much they ACTUALLY practice anyway. so, we are left with several questions. do they a) practice efficiently and less than we do b) practice efficiently and the same as we do c)practice efficiently and practice 10x more.
i think the answer is c. in between lessons, while eating, (don't go to the beach - i think that was mayla's point) entertainment is low on priorities, and they use the answering machine instead of running to the phone during a good session.
I think proffesionals practise more and more seriously, but probably not more then 4 hours per day on average. Actually, a lot of research has been done on what is called "The Acquisition of Expert Performance and Deliberate Practice". Check Dr. K. Anders Ericsson in Stockholm for example. For instance in the Psychological Review 3, pages 363-406 (1993) investigates "The Role of Deliberate Practise in Acquisition of Expert Performance". I found this a very interesting article.
It does a study with violist (different levels: established proffesionals, very good ones, amatures) and pianists. The results are compared with chess players, sports, typists etc. The conclusions could be somewhat conforting. If I remember correctly students that are on there way acquire the highest level seriously practise 26 hours per week on average (so 3.5 hour per day), but they do that every day (a very stable schedule). It is a little less for violists. More practise apparently results in injuries and burn-out. Established prof. only practise 14 hours or something (practise means: practise ALONE with the instrument, of course prof. still have to rehearse with orchestra, perform, etc.). Further more studies suggest that far more important to arrive at a high level is the drive and will to practise then to be a prodigies. A high level at an early stage says NOTHING of your level after 10 years. Deliberate practise is the key.
Basic conclusion:
Ten year rule: one needs to practise effectively for at least 10 year to get to the highest level (you might not be the best, but you will be very good). You need 10.000 hours of "deleberate practise" (not fooling around, full concentration). You need guidance to show you the most effective path (check the story of the Morse code operators).
To turn it around, you WILL BE ABLE TO PLAY eveything if you:
1) Get a good teacher
and
2) Practise up to 4 hours every day, until you have practised at least 10.000 hours.
(taking at least 10 year).
Hope you find this usefull.....
Regards, Joost