the process of becoming prolonged; when something (negotiation, conflict, recovery, etc.) lasts longer than expected
パンデミックの影響で経済の回復が長期化する懸念がある。
There are concerns that economic recovery will be prolonged due to the pandemic's effects.
交渉が長期化し、双方のコストが増えた。
The negotiations dragged on, increasing costs for both sides.
問題の長期化を避けるため、早急な対策が必要だ。
Immediate measures are needed to avoid the problem becoming protracted.