It was one of the worst staying experiences I had. I have traveled worldwide and never experienced a "hot water limit", even in developing countries.
I was taking a 15-minute shower in my hotel room after an 8h flight, and suddenly, the water turned cold. I had soap and shampoo all over me and called the front desk. They told me I most likely have exceeded the "hot water limit" my room had, and will not get hot water until at least an hour later and there is nothing that she could do. I almost wanted to scream -- what am I supposed to do with all the soap and shampoo all over me???
I kept trying, and trying, and the hot water never came back in the next 10 min. I had to be creative: I used a kettle to boil hot water and used a cup to rinse off the soap on me.
Needless to say, it was absolutely the worst experience one could have after a long flight. Still can't believe this could happen in Brussels, at a hotel I paid $200 /night for.