I work 8 hour days. But we have fairly flexible policy and I work at a company where nobody cares, as long as your pull-requests keep comming and you respond on

I work 8 hour days. But we have fairly flexible policy and I work at a company where nobody cares, as long as your pull-requests keep comming and you respond on slack :P Everybody just knows that for me, that won't happen friday-sunday. Negotiation looked like this: They: so we would like to hire you,what salary would you have in mind? Me: I'd rather you tell me, but I would especially be open, if I could have only 4 day work-week They, after some back and forth: ok, we would give you X Me: To clarify, X for a 4 day workweek? That sounds good! Them: Ehm, we meant for full week, but no problem with 80% X for 4 day workweek Me: ah, let me think it through Them: we can make it 85% X for 4 day workweek, if that would make it better Me: ok, will let you know ... by friday?