Cranebank is pretty full at the moment. The standard training 'package' is two pilots working a 'Carrel' CBT/Systems trainer then off to the Sim as a pair for the conversion package.
The whole course 'generally' takes about 21 days depending upon your experience and I seem to remember there are about 10 Carrels and three Full motion Simulators available for training. Add to that command conversions, continuity training and 're-treads' all jostling for the same Sims and I think you can see that it is pretty hectic!
The simple answer is I don't know how many are being taken each month but I do know that you can be pulled at very short notice for a course if someone fails or cannot attend for some reason.
Remain flexible if you can and please have a little patience. It is many years since I've seen 'Braincrank' so full!