DH and I got in the challenge and 5k. He had the desktop and his phone, and I had my laptop, phone, and a Fire tablet. My Fire tablet with the “Silk” browser got in. (The worst for registration.) Everything else was “more than an hour.” Luckily, after I registered, I reopened rD in a different window (same device), logged out and back in as DH, and he was able to register using his own account.
We didn’t want me to register him in my account and have to do the “transfer to his account and lose the registration, have no waiver to sign” problem. So thankful it worked because otherwise he might have missed out and I didn’t really want to get up three mornings at two o’clock while he slept in!