For Children I organize the year in the following quarters:
Fall - September to December (four months)
Winter - January to March (three months)
Spring - April to June (three months)
At the end of each quarter the Student will play (and perhaps record) a performance of a piece she/he has been working on.
Adults are again not constrained by such a fairly rigid schedule.
In Summer (July-Aug), depending on the year, I am often in Europe for academic related travel or vacation. Depending on the year, lessons will be suspended during these times.