Where or when did that request for the 80 minutes come from? You can't be asked to undertake a duty at the behest of the Company if you're not on duty. If we start now for the runway closure to help 'the wave', do you really think it's likely to go back to how it is? Following a DAY OFF, you are already expected to be briefing cabin crew 23 minutes before official sign on. That's 23 minutes violating YOUR DAY OFF!
Harry