If it were needed in a national emergency it's never more than 12 hrs away, another 25 minutes to put "RAF" stickers over the logos, yes a full repaint takes longer, so what?
No digs at the Company from me, but..
Never more than 12 hours away assumes there is a slip crew immediately available to bring the jet back - not necessarily true.
25 minutes is pure dreamland, particularly as the aircraft will have to move from the civil register to the military register for all sorts of legal reasons. That was estimated to take days, if not weeks, and certainly not minutes (unless they have found a way of speeding the process up - either way it's not going to be 25 minutes).
A full repaint won't be required, unless some fool has allowed the "green aircraft" to be painted in a charter air line's colour scheme (aren't all Voyagers being delivered in a proper military paint scheme?).