The duration for which a stent needs to remain can vary depending on the underlying condition and the type of stent used. Ureteral stents may need to stay in place for a few weeks to several months, while fallopian tube stents might be removed after a specific period once the blockage is resolved. Vaginal stents may be used temporarily to maintain patency post-surgery or may be part of a long-term management plan for vaginal stenosis.