The CEO of Dropbox has a 90/10 rule for remote work

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.