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by hnick 2689 days ago
Even in an office environment I've seen rough estimates of 5 (6 at most) 'billable' hours per day for longer term projects. The rest is admin, housekeeping, chitchat, etc.

Studies seem to support the 4-5 hours of useful work per day over long periods. It's easy to peak at 8+ for a short time (and twice as easy for personal passion projects) but it wears off.