u/Fly-Odd

I'm trying to print my detailed art work out for an A1 signage board.

If I set my document in photoshop to A1 size with 600ppi as well as scanning the art in 600dpi.

Will that be enough resolution to not be blurry or low quality when it's scaled up to that A1 size?

Thanks. I've tried working in 1200 PPI but it slows down the photoshop.

What's the best file size/PPI for A1?