*From my experience~*
As someone who dropped from 2k to 3.6k because of inconsistent playing, I can tell you that you can take a break for a week and still come back strong. You could take a break for multiple weeks and still come back strong (went 3k to 2.7k after like a month's break). However, if you keep taking breaks (like I did), you'll just keep falling.
The main thing you lose is consistency. It only takes a couple hours to regain your aim and stability (from experience), but it'll take way longer to regain consistency (basically FCing maps). Of course this only applies to maps that are at or above your level. I play around 6+ stars, so I can easily FC a 5 star even after a break.
As someone who dropped from 2k to 3.6k because of inconsistent playing, I can tell you that you can take a break for a week and still come back strong. You could take a break for multiple weeks and still come back strong (went 3k to 2.7k after like a month's break). However, if you keep taking breaks (like I did), you'll just keep falling.
The main thing you lose is consistency. It only takes a couple hours to regain your aim and stability (from experience), but it'll take way longer to regain consistency (basically FCing maps). Of course this only applies to maps that are at or above your level. I play around 6+ stars, so I can easily FC a 5 star even after a break.