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My (ex) business partner was awful for working late. He would be there at all hours with clients, papers piled up, getting home at 10pm and then having dinner, wouldn't go for a walk during the day, lunch a pack lunch sandwich and a kitkat at his desk, felt that everything would collapse without him there at all times. I will leave it up to you as to whether he was efficiently delegating and/or using his time.
Anyway he had a stroke and hasnt been in for the last year.
I am bad for it as well but we need to make time for health, exercise, relaxation, family. otherwise whats the point?
You sound like a super conscientious bloke, don't let your employer use it against you.