it even depends on the frequent of your sessions.
You become better if you have 2x 1 hours sessions a day, let's say 1 hour in the morning, 1 hour in the noon than playing 4 hours straight in a row.
The easier it is for your brain to make the neuro pathways in your brain stronger and creating new ones, the faster you'll improve.
This is why "PLAY MORE" is a quite dumb advice for becoming better.
Also: If you keep playing maps that you can already full clear or maps that are all super familiar in terms of rythm, jumps, streams etc. you won't learn something new.
Let's have a look on how sprinters do exercise in order to become better for their next competition.
When they practice sprinting 100 meters, they gonna exercise 150 meter sprints, so they push theirselves further. You can adopt the same thing in this game.
Instead of playing your usual AR9 CS4 maps, create some custom made maps from those, that you can play well but can't quite full clear yet, let'S say maps you can play around 94%-98% and incerase the AR or/and the CS just slightly, NEVER TOO MUCH!, let's say from 9.0 to 9.2-9.4 and the CS from 4 to 4.4-4.6.
On your very last session of the day, you gonna play these practice maps and nothing after that, let your brain adjust and rewire over night and you gonna realize the next day that you are way better in playing AR9 CS4 maps.
As a conclusion:
You can improve faster than most of the players at your ranks by only investing a percentage of the time they spend in order to improve if you exercise SMART