And if you've got a launch every 72 hours, then that means you have to build a rocket every 72 hours.
www.kekenet.com
外国人办理72小时过境免签手续入境后因特殊原因无法在72小时内及时离境，该怎么办？
What should be done in case a foreign national who has the 72-hour transit visa exemption cannot leave China within 72 hours due to some special reason after entry?
dict.youdao.com
酒馆的雇佣兵每48小时刷新一次,替代以前的72小时.
Tavern mercenaries refresh every 48 hours instead of 72 hours.
