There is no real set limit, it more or less taking your users into account based on desktop settings, so there is no scrolling left to right in their browser, desktop settings have a large range now a days.
Typically i make no logo more that 250 to 300 in height & no more than 400 to 600 in width and then use a filler back ground image to fill in the rest of the space, all that is based on a 100% span, that way the filler image will span across any browser window regardless of desktop size.
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