Lets look at it another way

If you miss the qr flight, how much will it cost on the day to follow plan b compared with flyinging out the night before and staying in a hotel.

Lets say, (just plucking numbers out the air for the purposes of the example) , the flight the night before plus the hotel is 300 euros.

Should it all go belly up, and booking onto my plan b on the day would cost 500 euros i may take the rusk

should itvall go belly up and booking onto my plan b on the day would cost 2000 euros i may not take the risk.

other factors , is the qr flight a one way or a return leg abd you already flew the outbound, or is it the outbound if a return and will the return will get cancelled if you miss the outbound?

What missed depart cover, if ant, does your travel insurer provide? Would they pay out on a 90 minute 'connection'.

you need to review all this and decide what you are comfortable with. Everyone is different.

All we can say is that if your inbound is on time you should make it. If its not on time there is a strong possibility you will miss it. There is about a 75% chance the flight will be in time.