How big is the chance that i will find the elevator ready for me?

I know zilch about mathematics and i think i should need to, to solve my question.
In my apartment building we have an elevator which i use to go up and down from/to my house.
Every now and then when i go to the elevator i’ll find it standing ready on my floor (the 8th), and then i wonder how big is the chance that it is standing ready there for me.
It’s a nine story building with 6 houses on each floor.
We also have a stairs (if that matters to solve the equation).
I realise this is not the most important ‘problem’ that needs a solution but maybe you are keen to help me?