How long can you do CLOSEUP WORK until your EYES get TIRED?

How long can you do CLOSEUP WORK until your EYES get TIRED?

As part of my work, I often edit documents on the computer. I can usually go 30 or 40 minutes of constant editing before I have to give my eyes a break.

If you're doing closeup work (editing, texting, sewing, knitting, crocheting, watch repair, etc.), how long can you usually go before your eyes get tired and you need to take a break?

How long can you do CLOSEUP WORK until your EYES get TIRED?
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