There is virtually no limit on the number of layout you create, if you have the proper license. (At least I think so)
I think that the time spent depend really on the overall design style you want to adopt.
For exemple a super simple, clean, and flat graphic direction will be way quicker to do than a complex, realistic one. I don't know if you're artistically skilled for that.
I would ask myself those questions:
-Do you want to use always the same sprite over and over like in Tetris or use a random generated level system? Basically, are you going to design each of those 175 levels one by one?
-How long is your time target? Are those levels like a Wario touch like? Couples of seconds for each, or like a longer time frame for each play which will imply to have a saving/password system.
I made a Pong-like game, and it run smoothly on every platform I tried. Including Android/IOS devices with touchscreen controls.