Timing it right

Administrative work in academia often seems like a waste of working hours. Would an academic rather spend his/her work time on a problem that is towards scientific and technological advancement or resolve issues pertaining to distribution of course load between faculty members, allocation of lab spaces, purchases of equipments, re-look at course program etc.? Even though often the latter option seems to contain the highly avoidable activities, I realise that if you want to have the infrastructure around you to work in a way that you feel it should and if it bothers you when it doesn't then it is time wise much more efficient to participate in the administration.
 
Having said that, I also feel that administrative work requires a certain level of maturity which comes with experience and in the beginning of your career you don't have much of it. Not only that, a new faculty member should have some time to settle into starting a research group and learn how to teach before getting involved in administration. So when is a good time for a faculty to start participating in administrative activities, and what percentage of the working hours should go into it? Also, what is good split of your working time between teaching related activities (include teaching hours, preparing for lectures, preparing assignments etc.), research related activities (include reading literature, meetings with research students, writing papers etc.), administrative activities (not immediately connected with academics) and miscellaneous (socialising, net surfing, etc.)?