The ongoing government shutdown now holds the record for the longest in U.S. history at 35 days and counting. It marks the second shutdown in a row that has lasted longer than a month: the other, during President Donald Trump’s first term, went on for 34 days before a funding deal was reached.Most shutdowns, however, have been much shorter. Not including the current one, there have been 20 instances of “funding gaps,” or periods of at least one day when funds weren’t appropriated, since Congress introduced the modern budget process in 1976, according to the Committee for a Responsible Federal Budget. Most of those lasted less than two weeks—and some only a few days.[time-brightcove not-tgx=”true”]Read More: The Longest Government Shutdowns in U.S. History—and Where This One RanksFour shutdowns—all while former President Ronald Reagan was in office—share the title for the shortest in U.S. history, each lasting just one day, according to a collaborative project between the Office of the Historian and the Clerk of the House’s Office of Art and Archives. Here’s what to know about them.Sept. 30, 1982 to Oct. 2, 1982This shutdown began, like all the others, because Congress missed the deadline to pass a spending bill to fund the government. But in this case that failure wasn’t the result of unresolved disagreements over the terms in the legislation; rather, Democrats and Republicans had managed to strike a compromise, but both had events the night funding expired, delaying the legislation’s passage until after the government had shut down, according to the New York Times.Oct. 3, 1984 to Oct. 5, 1984Two funding gaps occurred back-to-back in 1984: one that lasted from Sept. 30 to Oct. 3, and the other from Oct. 3 to Oct. 5. The first unfolded because Reagan and House Democrats disagreed over certain provisions related to crime, civil rights, and water projects, and days passed before the President signed a temporary measure passed by Congress. Lawmakers then failed to meet the new deadline set by the measure, and the government shut down, leading to 500,000 workers being furloughed for about half a day on Oct. 4, according to the Times.In the end, Democrats conceded to Reagan’s demands, including agreeing to pass a crime bill that the President had wanted and giving up provisions related to civil rights and water projects. Workers returned to the office the day after they had been sent home, the Times reported.Oct. 16, 1986 to Oct. 18, 1986The government shut down once again two years later after House Democrats pressed for provisions that the Reagan Administration was against, such as expanding welfare (what was then called Aid to Families With Dependent Children). About 500,000 non-essential federal workers were furloughed for half a day, the Times reported. The shutdown ended after Republicans agreed to vote on expanding welfare, in exchange for Democrats passing a funding bill.Dec. 18, 1987 to Dec. 20, 1987Democrats and Republicans disagreed over whether to send funding to the Contras, a rebel group in Nicaragua—a request Democrats pushed back against. Democrats also tried to reinstate the Fairness Doctrine, a Federal Communications Commission policy that had required broadcasters to cover various perspectives on controversial political issues before it was repealed earlier that year. The disagreements briefly shut down the government, but it reopened after Democrats agreed to send non-lethal aid to the Contras. They were unable to reinstate the Fairness Doctrine.Honorable mention: Feb. 8, 2018During Trump’s first term, there was a five-and-a-half-hour lapse in appropriations on Feb. 8, 2018 that was caused by Republican Sen. Rand Paul filibustering a bipartisan spending bill because of its cost, which delayed the bill’s passage until 5:30 a.m. Some have referred to it as a shutdown, but, according to the Committee for a Responsible Federal Budget, it didn’t result in any federal employees getting furloughed and it’s not counted among the 20 official instances of “funding gaps.”