Not sure this applies, but my AGM (6GFM-250) has a graph (scroll down to the right for the "discharging curve" which in proportion to 10 amps on 35 would be 71 amps on the 250. On that graph, it would last about two hours to flat dead. (then can you recover it? and if so how many times?)
Another table from Barre's book for a 100AH battery has its capacity
5 amps, 20 hrs, 100AH
14 amps, 5 hrs, 70AH, and
65 amps, 1 hr, 65AH
Where the 10 on 35 would be 28.6 amps, so somewhere under 5 and more than 1, so the 2 hrs with the other graph seems in the ballpark
http://www.esg100.com/index.php/product/index/g/e/id/35.html