i started 'serious' lessons at age 10.
once a month.....then at age 12 it became once a week, with clinics at least 3x a week.
i continued 1 lesson/week until boy's 16's.
i was lucky to have been a member of a tennis club and that was what i did everyday after school. parents arranged for me to get a ride to the tennis club every day. i did my homework there and then played until 7:30PM every mon-fri until my working parents picked me up.