That's what I saw in simulations for a 30 year mortgage shown by multiple banks. The amount of what I'd pay was twice the house cost. The interest rate was then around 3-4%, the appreciation rate about 2%, if I remember correctly.

So generally 100% more is a lot. However after 30 years you can sell the house, and what you get is still much more than renting, when you get nothing at the end.