The time frame for keeping up a Christmas tree can vary depending on personal preference. Traditionally, a Christmas tree is kept up from the day it is decorated until the Twelve Days of Christmas have passed, which is January 6th. After that, the tree is taken down and disposed of properly. However, some people choose to keep their trees up for longer periods of time, such as until the end of January or even through the winter season. Ultimately, it is up to each individual to decide when they are ready to take down their Christmas tree.