If using acrylic lacquer then you can get a cab respray graphics done in a day easy.. enamels? Probably do one colour one weekend and the next on the 2nd weekend due to the long hardening times.
Acrylic lacquer goes on thinner too and gives a more authentic finish
But.. it is easier to match colours with enamels.
I only use enamels these days for any hand line work on a PF restore and will only use the small tins of Humbrol as the paint within really is top quality