I compiled my first Linux kernel back in the mid 90s, mostly on 386 and Dec Alpha hardware, interesting enough both were not that much slower than what you mentioned, I think the alpha (a measly 21066) took about 40 minutes. If you had asked me back then, I’d probably have imagined a minute or two, 30 years later. Guess it says something about how much larger the Linux kernel has become.
I’m not denying there is a heat wave in southern Europe, but where I am in Spain, it was actually hotter last year. I’m enjoy this summer and am usually able to sleep without AC and at the same time I have family outside of the country calling and asking if I am OK because of what they see on the news. There is definitely parts that have it worse than others.