I received my copy edits from Harlequin. The copy editor processed the changes my editor and I made to the manuscript, and made grammar, spelling, and formatting corrections.
She had a few suggestions for additional edits, including an inconsistency in character introspection, a dialogue change, and a legal process that needed clarification.
Overall, not too difficult. For those keeping track of timing and other post-call activities, I was given four days to complete them.