for ages(plural)

• 这是许久以前的事。

  This is something from a long time ago.

• 他许久许久没来了。

  He hasn't been here for ages.

• 我们许久没有见面了。

  We haven't seen each other in ages.

• 我们讨论了许久也没有得出结果来。

  We discussed it for a long time but still didn't come to any conclusion.

• 我们讨论了许久，终于取得了一致的意见。

  We talked it over for a long time before finally coming to an agreement.