Regarding the shelf life of TDLC-102 concentrate kept under inert gas, it appears that after 1 month there is a slight decrease in negative density but after 2 months it becomes impractical to use (attachment).
Scanning the very thin negative from 2 months old developer gives an uneven sky :
It seems that the other low contrast developer I have used with CMS 20 II , called CD4-LC, may well be longer lasting than TDLC-102 concentrate, it has a lower pH and no phenidone.
It has the disadvantage that it requires re-use with increased time for successive films vs the one shot TDLC-102.