I was able to book them 45 minutes apart. When I was waiting on final park hours to be posted I had a day with a 7:30 Tusker House and a 6:45 Biergarten ADRs on my account at the same time.
When there is another account in play, we had them 15 mintues apart. Same situation, waiting for park info to post and we had an 8:15 H&V on my husbands account and an 8am CP on mine.