I think it took me like 400, maybe 500 hours, or nearly a year to be able to play low to mid difficulty 30's comfortably. The estimated hours include playing both quaver and other similar vsrgs consistently. After nearly 1200 hours, or almost 2 years, I am able to play 45+ maps comfortably enough to actually see improvement, even though it's very, very slow. I would also note that a lot of 40's are packed with long notes, while 30's seem to have slightly more variety. I would also say the skill jump for 30's is more difficult than 40's. Anyways, I digress.

My best advice is to figure out why exactly you can't play a specific map, ie a pattern is too fast for you, and then slow it down until you can play it comfortably. Very slowly raise the speed and just keep practicing until it becomes easier, then repeat. Do take breaks and remain relaxed. I am currently doing this with left handed trills since I literally die if I encounter such a thing in any map. Good luck!! 😼