收集了

collected; have/has collected

→ 收集
phrase Rare #25,578
collected; have/has collected 收集 means “to collect” or “to gather.” The 了 indicates a completed action or a change of state; in questions such as 收集了多久了, it can refer to an action that has continued up to now.
CH: 我已经收集了足够的信息。
EN: I have already collected enough information.

我已经完成资料收集了

I’ve finished collecting the information.

— 甜蜜的生活 (1960)

收集了这些照片多久了

How long has he been collecting these photos?

— 天使爱美丽 (2001)