Ian
I'll never get back to the level of work, I managed, prior to my heart stopping me in my tracks quite litterally.
Even at 60, I reckon I'd greater stamina than most 30 year olds and was still capable of a 24 hour shift, followed by a couple of jobs the following day.
The heart problem has absolutely nothing to do with overwork, but is partly genetic, partly our historic diet containing too much salt, sugar and animal fats.
In theory, I really shouldn't be doing c/c work at all, but I have a young family, with all the usual expenses.
best wishes
robbie