Mana,
Further to the hours requirement for command here the FOM still states that accelerated commands will only be offered when there are no other eligible FOs available. So regardless of what recruiting has told some joiners, all FOs are on the same list, arranged by date of joining. Only when there is no-one above you who meets the criteria will you be given the nod. I think there are some 1100 FOs on the list at the moment, take away a few hundred for cadets, and taking it that most guys at the top of the list are of 4yrs or more in the company, I would suggest not planning on the accelerated seat change.
I think new joining FOs now are looking at 7 to 11yrs for an upgrade (depends on which office dweller you speak to).
Good luck,
The Don