Perth Western Australia People! Jacobs Ladder?

How many calories do you suppose you could burn walking down then up Jacobs Ladder in Perth City. Of course weight, height, speed etc etc needs to be taken into account, but I just want to know for an average person, walking it, no running, just average speed..How much do you think you could burn?

BTW its an (approx) 250 step staircase with about a 43 metre steep decline.
Perth Western Australia People! Jacobs Ladder?
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