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At least twelve hours 7X7 working on a 22" screen at whatever font size comes my way. I've used multi-focal glasses for years, but never any eye strain or headaches. For recreational reading, I use a 6" eink Sony and have no problems with standard font size in broad daylight but tend to increase by a single zoom level in dim artificial light (bedside lamp, etc) for comfort. Good luck and best wishes. Neil
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