When can I see comments for a segment?

For comments to be visible on segment-level, you need to have at least the same amount of users in your segment as the minimum segment size in your settings.  As long as the criteria for the minimum number of users is met, all comments will be displayed.

For example: your minimum segment size setting is 5. If you have 5 or more users within one segment, you will be able to see the comments as soon as one user has left a comment. This applies for survey comments and general comments.