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The CEO of Dropbox has a 90/10 rule for remote work
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I have a designated-remote job, but I'm also in a role that's periodically customer-facing. For accounting purposes, the time I spend working from home in my home office is considered 'remote' and my time on-site at customer premises is considered an off-site event. Not sure how they do it at Dropbox, but that gives you an idea of how the time categorization goes.