Most folk aspire to a Passenger Command.
(For those unaware, CX will offer you a
Freighter Command, but the pay and conditions are so poor that as a new joiner you can achieve this with less than 2 yrs experience,
if you can get through the course).
How long to a passenger command then?
CX have never acheved more than about 100 commands a year. Of these, about 20 are on the freighter, leaving 80 Pax Commands Per Year.
There are just shy of 1400 pilots that are not captains, so as a new joiner, this is the number of commands that need to take place before you get your shot at a pax command. 1400@80 per year comes in at:
17 years to a CX Passenger Command 
This is conservative, for sure - perhaps CX will manage to increase the rate of command training. Bear in mind also that an increase in Retirement Age is around the corner which will increase time to command.
Milly