great in small doses


Senior Member
From movie <Meet the Fockers>,
Byrnes and Focker, they're going to have a parents meeting to set the wedding date.
Byrnes - Your parents are great.
Focker - They're great in small doses.
Byrnes - 48 hours in Coconut Grove is a small dose. Besides, you've won over my dad.
What does "great in small doses" mean? Thank you.
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