Here now and the new rider swap has gone fairly well at both MK and HS. All RS passes have been good for the entire day, so no expiration time. We used them right away though, but they clearly stated in my app that they were good for the rest of the day. On BTMRR the RS pass start time was 30 min after I entered the FP+ que (standby was 80 min, so it wasn’t accidentally assigned based on that). I was done in 15 min and didn’t realize the time issue, so when DH went to use it it didn’t work, but he explained to the CM that he had a RS so they let him on. At the HS Star Wars ride the CM issuing the RS was not by the FP+ line, so the kids and hubby were out of her line of sight when found her and asked for the swap. She gave me a hard time and asked why we both didn’t just use our FP+ on the ride and ride one at a time. We had other group members who wanted to ride with me so we needed the RS. She gave it to me after I explained to her multiple times that I wanted to have a buddy to ride with me and needed the RS in order to do so, but she told me it might mess up the rest of my fast passes (it didn’t). Those were the only issues though. None of the rides we got RS for (BTMRR, TOT, Rock n roll coaster) required us both to have a FP+ to get the FP time for RS.