The survey takes 15-20 mins unless you're a little slower reader then it can take up to 30 mins. It's 1 per household and will ask for access to your OHIP info. So if you're someone who's very private it's not recommended. I did it and didn't see anything wrong with the things they asked. It's for health, and a $10 gift card is cool too!
https://ontariohealthstudy.ca/en/gif...0414Ra0518.htm