Canvas Size and Some Help…

[c0mp0ser]

Hello everyone!
What’s the maximum canvas size on ASP for iPad Pro (11-inch) (2nd generation)?

I’d like to send some of my work to a professional printer (18x24” = 5400x7200pix 300DPI & 24x36” = 7200x10800pix 300DPI).
Do I start on actual canvas size (18x24” @300DPI) or half the size (9x12” @600DPI) and then enlarge to actual size?
Or, start at double the size @300DPI and then reduce to actual?
Google search suggests that it’s always better to start at double the size.

Any help is greatly appreciated…

[Hyperflex]

Physical size is pretty much irrelevant to a digital painting program, it's the resolution that matters.

18 inch x 24 inch @ 300 dpi is 5400x7200
9 inch x 12 inch @ 600 dpi is also 5400x7200

So both are identical and will produce the same results

[c0mp0ser]

Thank you, Hyperflex!