What should be the ideal or Avg split times for 4x4 yau for sub 1:30 and sub 1 min?

I am trying to improve but don't realise where I'm lacking I can avg around 1 min 20 sec, idk what stage I do fast and which are worse, if I know what time's I am getting at each stage compared to sub 1 min splits, I will work to improve there, thank you for helping