Your LimeSurvey version: LimeSurvey Cloud Version 6.4.12
Own server or LimeSurvey hosting: Limesurvey hosting 
Survey theme/template: fruity_twentythree
==================
Hello,

I have a question group containg 21 "Multiple short text (Input on demand)" questions (each of these set to min 2 to max 4 answers). Participants should answer at least 10 of the questions (giving 2-4 answers for each) within the group before they can continue the survey,
How would I do that? I've dug around the forum and manual but couldn't find anything explaining how to do this. 

Thank you! 
 

Hi,

each of these set to min 2 to max 4 answers

So, how can you proceed without fulfilling this requirement?
So all questions have to be answered.

But what exactly is your requirement?
That at least 10 questions are answered generally,
countifop(">","0",count(that.Q1.NAOK),count(that.Q2.NAOK),count(that.Q4.NAOK),count(that.Q4.NAOK),...)>9

or that at least 10 questions are answered with at least 2 answers?
countifop(">","1",count(that.Q1.NAOK),count(that.Q2.NAOK),count(that.Q4.NAOK),count(that.Q4.NAOK),...)>9

Better: You show us your scenario. Send the lss export of the survey.

Joffm