If the rumoured extra A320 and 2x F100's turn up and the ATR is transferred to the VA AOC then commands could be 6 months. Don't forget that not all current FO's are able to or want to bid for a command on the F50.
Its not all about time to command, you may be in a better position to bid for FO on the F100 as soon as you can; jet time, better flying hours and pay.
As for pay, I have heard of F50 FO's that are prepared to work extra flights and RDO's making over $25k extra a year. Some of these allowances are also not taxed, so even better. The current VARA EBA is pretty heavy in allowances such as meals, over nights, PACR, productivity, worked days off, etc, so its not hard to make some extra cash on top of the base salary.