Learn what "pamela must have" means, when people say it, and how to use it naturally in English.

It means the speaker is making an inference about how long the person worked on the information.
From School Hall, Episode 38
Someone guesses that Pamela spent years collecting information.
Use this when you are drawing a conclusion from evidence or a lot of preparation. It sounds natural in detective or mystery talk, but not as a general everyday phrase.
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