Depending on the flow of the relationship, around how long would it take for you to feel comfortable letting your partner use your credit card, drive your car, have a key to your house, etc?

For me, I would probably say a couple of months. I know some people who would never let their partner drive their car or use their credit card lol, so if you wouldn't, why wouldn't you? Also, have you ever let an ex partner have too much access too early and get burned for it? I'm sure if you have, that would impact how easily you trust moving forward.