So I just had an interview last Friday and I think it went really well. I'm about 90% sure I'm getting an offer. Should I still send a thank you email? Also, I got a call on the same day from another company I really want to interview for as well. If I get an offer from the first company, what do I tell them to buy some time so I can interview for the second company? What's considered an acceptable amount of time to ask for before I accept an offer?