Another question to add to this thread, would it be that difficult to source the 500 hours multi command during the REX six year period, as in on days off or annual leave??
It will be difficult to source a loaf of bread on your days off with what Rex pay a FO!
They also own your duty and work you very hard, sometimes flying you six sectors in a day. I highly doubt they will be happy with you burning your duty with another operator on your days off! In fact I would be pretty positive it will be in your contract that any employment outside rex must be approved by management. It is in my employment contract!