How long does it usually take to reach 4 star maps?

I am still pretty new to the game and have about 24 hours of playtime so far. I can currently get an S rank on a few low 3* maps but everything else feels like a massive difficulty spike.

I wanna know what the average progression timeline looks like for most people. How many hours of playtime did it take you to get comfortable with 3* maps and finally reach 4*?

I feel like Im progressing slowly and want to know if hitting a wall at this stage is normal. Please let me know what your experience was like or if you have advice for breaking through this stage.