How do you decide when a paleoclimate proxy record is complete enough to publish?

I keep running into the question of how much of a sediment core or speleothem record needs to be sampled and dated before it's ready for a journal.

Reviewers often want more resolution or more dates, but at some point the record has to be called done.

How do you decide when a proxy record is complete enough to submit, and how do you head off reviewer demands for more data?