How can I increase opacity over time?

I have a level TOP and I would like to change the opacity so that it starts to slowly increase when I hit play. Basically what I want is at frame 1 the opacity is a value, and let’s say by frame 50 I want it to be a higher value. How can I do that?

if you want the opacity to be directly linked to the current frame number, you can type a Python expression in the opacity parameter, such as:
me.time.frame / 600

This means at frame 1 the opacity will be 1/600, and at frame 600 opacity will be 1

Thank you very much!!!