How to solve execution time issue of AppScripts for non-G suite users?

I have an attendance system which is working fine for G suite users (execution time is 30 minutes) but I want to make it running for all gmail users (execution time 6 minutes). When a teacher presses a specific menu at my Google Sheets page, it allows students to report their attendance from an Android App to Google Sheet for 10 minutes.

The whole code is working fine for G Suite Users but I want to make it for all Gmail users. I tried to execute it from a regular Gmail but it shows Timed Out at the end.

I have the following two lines of code for students to have 10 minutes to respond:

function refreshSheet(){

  //Few other lines of codes are here

  var val = dashboard.getRange("C6").getValue(); //C6 is a dropdown list in Sheets of "Start 1-Period" and "Start 2-Period"
  if (val == "Start 1-Period"){ ScriptApp.newTrigger("onePeriod").timeBased().after(10*60*1000).create();}
  if (val == "Start 2-Period"){ ScriptApp.newTrigger("twoPeriod").timeBased().after(10*60*1000).create();}
  
  //These few lines of codes below within the refreshSheet() should be executed after the above called trigger and its function execution.

  for (var i=0; i<students.length; i++) {
      if (students[i][0] !== '') ss.removeEditor(students[i][0].toString());
  } 
  
  protectionm.remove();  
  SpreadsheetApp.flush();
}

function onePeriod(){}

function twoPeriod(){}

I reviewed few posts here but none of them is working for me. How can I solve it?