Minimum days without swimming that will get you rusty?

How many days without swimming (illness, travel...) will make you rusty? Not only losing the speed, but also losing the techniques? How long does it take for you to recover the previous best performance? I usually swim 5 days a week, with Tuesday and Saturday off. If there for some reason are two off days in a row, then the next practice usually feels a bit weird, but not necessarily slow. A week off and I'm fumbling to find my strokes. But technique can disappear in the middle of a consistent training period, in my experience. Right now I can't seem to remember what to do with my left arm during my breaststroke turn (I turn to the left)! Out of the blue I've started doing something strange which creates a lot of drag. For me, breaststroke is usually the first to fall apart, and the hardest to get back. It took me almost two years after my 21 years hiatus before I could swim breaststroke with any feeling of fluency and power.

How many days without swimming (illness, travel...) will make you rusty? Not only losing the speed, but also losing the techniques? How long does it take for you to recover the previous best performance? I usually swim 5 days a week, with Tuesday and Saturday off. If there for some reason are two off days in a row, then the next practice usually feels a bit weird, but not necessarily slow. A week off and I'm fumbling to find my strokes. But technique can disappear in the middle of a consistent training period, in my experience. Right now I can't seem to remember what to do with my left arm during my breaststroke turn (I turn to the left)! Out of the blue I've started doing something strange which creates a lot of drag. For me, breaststroke is usually the first to fall apart, and the hardest to get back. It took me almost two years after my 21 years hiatus before I could swim breaststroke with any feeling of fluency and power.