My neighbor paid 2 coats, but I caught them doing one and lying.
Depending on house 2 may be better but not for 50% more as spraying a
second coat while you are set up is easy and second coat may only take
20% -30% more stain, if first coat is done heavy. One heavy coat for
most is enough. Even white over black if wood was bare and weathered. A
recoat is different as are all houses. On my cedar house the south side
only needs 2 coats .