protracted

持久的冲突

a conflict that continues for an unusually long time

持续时间异常长的冲突

a disagreement that lasts for a very long time

negotiations that continue for a very long time

持久的斗争

a long and difficult fight or effort

一场持续很长时间或比预期更长的战斗。

a legal case that takes a very long time to resolve