A clue from the script may be found here. i included the lead up sentences for context. The important part is in bold:

"How long have you been working together?
- Well, Frank's been working with him...
...since the Stone Age, but I've only
had to endure two years of servitude.
Jack.
Jack, we got the results.
Six to eight months? That can't be.
That time scale isn't in months.
It's in weeks."