you can change as many times as you want until it becomes 150 (in production). how much time you stay in 111 and 112 depends on your production slot.
but note that getting DCT may push your production way back.
2011 E92 M3 DCT
1991 Spec Miata
2008 E92 M3 DCT - KW Competition 2-way / Brembo 365 BBK / OMP ARS racing seats / rear seats delete / GT4 aero / AiM EVO4 data logger / SmartyCam racing camera
2008 E92 M3 6MT
2008 E92 335xi