Yes , I just had to try that again yesterday evening, the weather is so nice I had to go out. The stairs are on the back side of a ski slope by the lake nearby my place.
I will have to count again but I guess there are around 250 steps up and when you arrive at the middle it is getting very steep, which makes the last part even harder to climb / run . I did not run in one go yesterday either… but it felt better than the day before.
I will give it a rest today and try again on thursday – friday..