Pick two days you know — the start and end of the gap — and say what the work was at each. The AI drafts believable entries for the working days in between, using any logged site data, as one natural progression from the start to the end. Review each before saving. If a bracket day isn't written up yet, your words for it get saved too, exactly as you type them.
Draft missed entries
Review each day before saving — untick any you don't want, edit the text freely. Days with no logged data are marked and unticked by default.