If they are consecutive dates, then just use one start/finish time.
i.e Start 9:30 5-4-2018 and Finish 17:00 6-4-2018.
The ical will work then.
If they have different start times on each day, then the Face-to-face does not send separate ical attachments for each addtional date in a session. Feature/bug
As we want to record attendance for each session, we set them up separately and ask the students to sign up for the sessions they need to attend. By copying sessions, It is almost as quick setting them up as it is adding new dates to one session.