I'll just jump on this thread rather than create a new one..

I'm Flying LHR-MAD-OPO and return in June. I've just noticed that the flight times have changed and the booking page is asking me to review/accept the new times. O/B trip is as follows:

IB3175 LHR-MAD arr. 14:05
IB3094 MAD-OPO dep. 15:40

As you can see I have 95 minutes. I THINK both flights are T4, I don't see T4S mentioned. Is this doable? It's all on one booking but I just wanted to make sure.