?......so due to commission and dividends, it could be argued I am rewarded for extra hours.
I try not to overdo it, but at the same time, my wages and livelihood are based on what I generate, rather than how many hours I do, so if extra work is needed to achieve a target, it has to be done.
This is pretty much where I am for the record, the difficulty is then working the extras around two young kids with school runs etc. I'm lucky to have a flexible boss and to a degree I'm in control of my own diary as long as it's aligned to the success of the work I do / team I support. I wouldn't say I work sixty hours a week and neglect my kids, but I probably work 45 hours including the odd phone call and work travel outside of core hours. I believe I've the right balance for me vs my reward package.
I'm sure if I helped close a £250k deal his morning my boss wouldn't begrudge me a slack afternoon, but also if our team was short of target he'd expect me to be balls out helping to rectify that.
It's all a balance which is both industry related and personally acceptable to you - only you can define what is acceptable and you pitch you career around that IMO.
I believe in being asked to work e extras, or being grown up enough about it to determine that myself, I don't believe in being "told" to work them. However that statement is much easier to behold when you have some career experience and much more difficult as a young employee.