The latest commanders who were promoted this summer have been in the company for approx 3.5 years. Very lucky chaps who leap frogged over a bunch of CTC guys who haven't quite got the hours yet.
However with little expansion next year there prob won't be too many commands next year. Therefore CTC guys will catch up pretty quick. 4000hrs required at Monarch for command. After that I reckon time to command will drop to about 5-6 years.
However, as someone has already stated things can change at the drop of the hat, and so you could bin everything I've just written.
My experience at Monarch. Currently an F/O, not the best payers in the industry, but I have a LIFE. I'm on 320/330 so can't complain. Great bunch of people to work with. I must admit that Captains do work a lot harder than us.