You've never had a stomach bug?
It really does depend, sometimes it can just be mild stomach ache but that's about it.
Other times it may be 'its wise not to be too far from a toilet' but otherwise ok
And then other times it can be a lot worse (whether diabetic or not), one time I had a really bad case of gastro-enteriritis (I think that's what the hospital said it was) about 20 years ago but I literally couldn't hold anything down, dont know what caused it, I hadn't been away anywhere recently - I've never had it happen again
Yeah sure I've had some stomach bugs - probably normally due to food I've eaten and not due to my diabetes
But basically there is no average for stomach bug, cant tell til you get it what or when its going to be,