Is there any place on UA's website where the minimum connection times are listed?

For my upcoming mileage-run, I have planned a short connection at RNO (arriving from SFO and departing to SFO on a new ticket within 56 minutes) and at LAX (arriving from SFO and departing to LAS on the same ticket within 38 minutes).

Until some weeks ago I was able to book these connections on the UAL website, but now they are gone. I will be traveling with no luggage at all, so that won't matter, and stay on UA mainline all the time. Any idea if I can make that connections?

Greetings - Dirk