It's a little difficult because we don't usually just write peoples work for them especially when what you are asking for has hundreds of examples. I do not mean that to be rude sincerely, but its been answered a lot so just asking us to write it is not really fair to us.
Also, you say you want to send them an email invite from a shared mailbox for some period of time, but you haven't explained how the flow (even a human) would know the times to send.
Now as a base you would do.
1. When a new form response is submitted
2. I would personally add 3 Scopes (this is ONLY because I am an OCD bad), Scope 1 would be Answer Section 1, Scope 2 would be 2 and 3 would be 3
3. Inside each scope, have a condition that checks if they answered and therefor needs a calendar invite
if the condition is true, then send the invite
make all 3 the same way. Now I didn't include error handling etc but some other things
1. Make sure you are sending them onbehalf of the Shared Mailbox as you configure it, make sure you have permission to do so since its your connection, or log in with the Shared Mailbox account (if there is one) and build the flow WITH that account so its connection is its own.
2. Help us to determine the time you would schedule, as the steps above are correct except small caveats)
--How do you determine if they answered. In the Condition you would have to see if the Answer is empty and then you know not to respond with a calendar invite
--what is the time frame you would put in the Calendar? I don't know where you would put that information, other than sharing you could put it in SharePoint and do a look up to that by having something like
SharePoint List
Columns: QuestionNumber and CalendarTime
Then in QuestionNumber just have 1 or 2 or 3 and then the calendar times.
Then you would do a GetItems in each Scope, but with an odata filter of QuestionNumber eq 1 (or 2 or 3) depending on the scope DONT add the ors its just saying one or the other.
If you start putting that together we will absolutely help you :-)
If these suggestions help resolve your issue, Please consider Marking the answer as such and also maybe a like.
Thank you!
Sincerely, Michael Gernaey