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it's been a long time since + past event
It's been a long time since we last met.
我们上次见面已经很久了。
久已；很久以来
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久已；很久以来
used to indicate that a considerable amount of time has passed since something occurred
It's been a long time since we last met.
我们上次见面已经很久了。
It has been a long time since I visited my hometown.
很久以来我都没有回过家乡。
A long time since we last met, you haven't changed a bit.
自从我们上次见面已经很久了，你一点都没变。
It was a long time since she had felt so happy.
她已经很久没有这么开心了。
It's been a long time since we last met.
我们上次见面已经很久了。
It's a long time since I visited my hometown.
我已经很久没有回家乡了。
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固定短语，常与现在完成时连用，表示从过去某时至今已很久。
Dictionary facts from BridgeDict normalized sources.