It would be much more interesting to see how many days of gas runway each country has based on historical usage.
German Grid regulator BNetzA created forecasts based on historic consumption and assumed savings. But right now we have storage level way above even the most wildly optimistic scenario. This forcast is so hard i don't think it has any merit.
You can have a look at the AGSI+ [1], they list a Stock/Consuption ratio as 22%. But this number is IHMO meaningless, as it does not mean all is well for 22% of a year = 78 days, and than everything collapses.