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Continue to ChatSoftware development takes immense intellectual effort. Even the best programmers can rarely sustain that level of effort for more than a few hours a day. Beyond that, they need to rest their brains a bit, which is why they always seem to be surfing the Internet or playing games when you barge in on them. - Joel Spolsky from https://whatsmyquote.com/quote/software-development-takes-immense-intellectual-effort-even-the-best-programmers-can-rarely-sustain-that-level