the ATP doesn't say that Lendl was in the top-2 until the 13th of december 1982, they say nothing about Lendl's ranking between the 11th of january and the 13th of december, which is very different.
For these years where the ranking history doesn't give all of the weeks for each player, you have to look at all of the players to get a better opinion :
- here McEnroe was number 1 on the 1st and 15th of november 1982 : http://www.atpworldtour.com/Finals/2...nroe.aspx?t=rh
- Connors was number 1 on the 13th of september and 8th of november and number 2 on the 15th of november : http://www.atpworldtour.com/Finals/2...nors.aspx?t=rh
Then, already you can be certain that Lendl was not in the top-2 on the 15th of november 1982, which is known for both McEnroe and Connors, and it's very likely that he was not in the top-2 on the 1st of november considering McEnroe was number 1 on the 1st of november and Connors on the 8th of november and before on the 13th of september.
It's possible that Lendl (who had just defeated McEnroe in the US Open semifinal) had got to number 2 after the US Open 1982 until the 1st of november, that would make at most 410 weeks in my calculation.
After the US Open, McEnroe won San Francisco, Sydney, Tokyo and Wembley : maybe that could have given him a jump from number 3 to number 1. I don't know. Personally, I had rather thought that McEnroe had just fallen from number 1 to number 2 then got back to number 1 rather than fallen from number 1 to number 3 and then got back to number 1 but maybe the people who made the wikipedia source know better, I don't know.