Well, I am not very knowledgeable of your poker abilities, but here's what I'm thinking.
So, about 6000 join the Sunday Million each week. There are 104 weeks in two years. 6000/104 = 57
So, that would be 1 in 57, however you seem to be better than the average runner in the tournament. I'd predict an ROI of say 10-20%. So, lets say 15%. 0.85*57 = 48.5
So that's 1 in 48.5. But, I'd predict that your weaker than the average player in the final table. That has large implications on your odds. I'll guess that once your in the final table, you'll only win about 7%. (11/7)*48.5 = 76
So, using my random calcultions, I'd guess 76:1