@DifficultPifcultLemonDifficult Completely ignoring the fact the question op asked is irrelevant to you, telling us all that you do more than the bare minimum for your kids and passively aggressively suggesting its not all men (even though op never implied it was)?
Sorry, but I read the title "How long did it take for your ex... To quit work or go self employed once they started paying child maintenance??" to be passively-aggressively suggesting that such behaviour was par-for-course amongst men, much like asking "How long did it take your stone to hit the water when you dropped it off a bridge".
I'm aware alot of men are rubbish. My dad was one, and though he's contrite about it now and desperate to make up for sins past, my mum's experience did ingrain into me that I should damn well try harder. I can't claim to be "great". I'm only human. But I honestly try to up my game as much as I can and take responsibility when I fall short. So, when you do all that but still get met with eyerolls and paint brush's tarring you as "men, your all the same!" then, yes, it can provoke a reaction. I just want to scream "some of us are trying dammit!" I just don't want to be judged on my gender, much the same as you likely don't. So when I see blanket statements being made, I want to make people aware of that. It's not about me saying "Hey! Aren't I great?!"
But you're right, this isn't the thread now and it's not helping to answer the OP's question, so I'll butt out.