So, timed levels were as a whole a hated feature, though people liked a few timed levels such as 252, which became known for players earning millions, or even billions of points. Said level was converted to a moves level in early March 2018, which made it much harder to earn millions of points.
Thus, timed levels were (unfortunately) removed because of their difficulty back on May 2018.
I didn't came for timed levels since I started playing the game almost three years after timed levels were removed.
I hope they bring back them soon.