Help with designing large files in photoshop?

xashleyx06

New member
Ive been using photoshop for many years now, but Ive never used it to design large things such as banners and billboards. I just recently made a banner, but it took forever to do anything because the file size got to be about 2.5Gb.

The banner i was designed was printed out at 6' x 15' but i designed it at 1/4 scale and 300 dpi. I kept the res at 300 cause i dont want it to print out pixelated or anything....

So my question is, at what scale and resolution should i make large file so they still print out good quality but aren't insanely huge files.
 
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