We owned a Paint supply company for 30 years, so have some experience. On a pre-painted wall - a good quality, external textured coat you should get 6sqm/ 1lt for first coat and 8sqm/lt for second coat (Micatex, Dulux, Plascon) Best is Dulux Weatherguard, currently on special at Builders W/H...
I have just applied for the Discovery Three Month Waiver. The monthly contributions will be offset against my MSA (Medical Savings Account) So it is not actually a "holiday". One must have sufficient MSA funds available to cover the three months contributions.