50" 4k Samsung, I use it as desktop @ 3ft. Works great, after some tweaks of contrast and sharpness so text is optimal. I have reading glasses but I don’t have to this way. Prob 55" would work also. Above that, your word processing and spreadsheet might get a bit weird. Check in a big store and ask them to pull up a word processor? (Still does not say much, you need to tweak for text). The screen need to be MAT, not gloss.
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