This shutdown is already one of the longest ever.......
The partial government shutdown has stretched 18 full days, which is three days short of the longest federal funding gap since 1980. A compromise did not seem imminent as newly empowered Democrats passed a package of bills to reopen the government without border wall funding, despite a veto threat from President Trump
The funding gap — the third this year — shuttered large parts of several key Cabinet departments and federal agencies starting on Dec. 22 when Congress failed to pass a budget. About 75 percent of the government has already been funded by Congress, but major departments such as Homeland Security, Justice, Agriculture and Interior remain unfunded.
Several shutdowns were resolved in a matter of days as negotiators worked out a deal to reopen the government. Some funding gaps lasted such a short time, such as overnight or on weekends, that government agencies did not fully shut down.
Why shutdowns happened — and how they ended
https://www.washingtonpost.com/graphics/2019/politics/longest-shutdowns-history/?utm_term=.de42aad1fe20