B: I was hoping next week, but we can make it two weeks if that's better for everybody.

Could you let me know what "we can make it two weeks" means?

If today is January first, does it mean we can have the meetings on Jan 8th and 15th both?

I asked my friend and she said "It means if you can’t make it in one week, they can extend it to two".

So I thought it meant 8th and 15th both, since "extend it to two weeks" is what I understood,

but my another friend said it means only 15th, not 8th.

Could you explain why?

Thanks.