I guess what I want to understand is if for example you are a tech lead or PM and you "need" to deliver by a certain date and to achieve this you need others to work overtime - how can you do this? I think that is something I would struggle with as a manager or business owner, nearly every manager I know isn't in a position to offer anything for this service and a lot of employees I know who put in the hard yards for a sustained period of time don't get any financial/time reward for it...