Yes spot on I change mine every 2-3 days but it does depend I find either it gets a bit sore or itchy around site so I change sooner or blood go up a little bit
Same as CarbsRok. And - naughty as this is - I have forgotten before, and left them a day longer. I'm lucky in that my BS doesn't rise, but if it did start to rise before the prescribed change day, I'd change earlier.