Japanese to English Bus/Financial Business/Commerce (general)

Basically this is a list of different types of training, and how often the person has to re-take training classes for that particular qualification, to keep it current.

Qualification A: 2年の間で実施
Qualification B: 3年に１回以上
Qualification C: 1年に１回以上

Basically there is a long list after this, that says X年に１回以上. The only one out of this that seems strange, is 2年の間で実施. This sounds like, 'over a period of 2 years' to me, but it seems very strange that they would have to take 2 years' worth of classes for this. (It's an internal company qualification that would be handled by training classes, not a university degree or anything like that.)

Could 2年の間で実施 just mean ２年に１回？

I appreciate your help with the nuance here.

Thanks!