I understand that the thinking behind that advice is because if your BG is out of range as a diabetic, there is more of a breeding ground for bacteria so they should be replaced more frequently. However....
This is part of the Health and Safety belt and braces that seems to be attached to everything nowadays
. If you have good BG control, and look after your lenses, cleaning and disinfecting them, you should have no problems . It's whatever feels comfortable for you , but certainly question this advice if going for two days without lenses is inconvenient for you .
I too used to have hard, then gas permeable lenses, and used to take them out and suck them if they felt dry
this is NOT recommended for anyone, diabetic or not, but there's nothing wrong with my eyes , luckily ! In fact, I use continuous wear lenses with no problems for up to two weeks if I'm on a hiking/ camping trip, otherwise, monthly lenses all day, everyday .
Signy