I didn't keep all my results in writing, but I do know that at 3 days post metho, my hcg was 7700; 7 days post- 5549, 14 days post- 1445. 3 weeks after that, my level was 15. So, it was a little over 5 weeks for my levels to get close to 0, and my hcg was not nearly as high as yours. But, don't be surprised if AF doesn't show right away. It was another 2 weeks (after hitting 15)that AF showed up. And it was not any worse than any other AF I had before.
when i got the shot of metho on april 28 my hcg level was 954 than aweek after that it went to 633 the next week it went 331 the following wk it was 108 than the next wk 33 and the wk after it was 3 and now this wk my test came back a 2 so i guess it does take time good luck with your progress