GTM TAG timer with measuring time seen on page and variable length by content

// Full version
<script>var TimerDynamicSetting = {
      count: 0,
      repeat: 2, 
      active: 1, // Is timmer active?
      customtime: 10000 // Minimum timer time in seconds
    },
    TimerDynamicvar;

 // Setting time according to content length
 // dl.pagePostType2 - Wordpress variable from plugin DuracellTomi's Google Tag Manager for WordPress
  try {
    if ({{dl.pagePostType2}}.includes("single-")) {
      TimerDynamicSetting.customtime = TimerDynamicSetting.customtime + Math.floor((document.querySelector("#main")
.innerText.replace(/(^\s*)|(\s*$)/gi, "")
.replace(/[ ]{2,}/gi, " ").replace(/\n /, "\n")
.split(' ').length / 228) * 60 * 0.25) * 1000;
    }
  } catch (e) {;};

  //Timer with pause and resume function
  function TimerDynamic(d, e) {
    var a, b, c = e;
    this.pause = function() {
      window.clearTimeout(a);
      c -= new Date - b;
    };
    this.resume = function() {
      b = new Date;
      window.clearTimeout(a);
      a = window.setTimeout(d, c);
    };
    this.resume();
  }

  function TimerDynamicStart() {
    TimerDynamicSetting.active = 1;
    TimerDynamicvar = new TimerDynamic(function() {
      TimerDynamicSetting.count += 1;
      TimerDynamicSetting.active = 0;
      dataLayer.push({
        event: "TimerDynamic",
        "TimerDynamic.count": TimerDynamicSetting.count,
        "TimerDynamic.repeat": TimerDynamicSetting.repeat,
        "TimerDynamic.customtime": TimerDynamicSetting.customtime * 0.001
      });
      clearTimeout(TimerDynamicvar);
      TimerDynamicSetting.count < TimerDynamicSetting.repeat && TimerDynamicStart();
    }, TimerDynamicSetting.customtime);
  }

  function handleVisibilityChangeForTimmer() {
    "hidden" == document.visibilityState ? 1 === TimerDynamicSetting.active && TimerDynamicvar.pause() : (dataLayer.push({
      event: "visibilityChange.on"
    }), 1 === TimerDynamicSetting.active && TimerDynamicvar.resume());
  }
  TimerDynamicStart();
  document.addEventListener("visibilitychange", handleVisibilityChangeForTimmer, !1);</script>
  
  
// minimalist version
  var TimerDynamicSetting = {count:0, repeat:2, active:1, customtime:10000}, TimerDynamicvar;
try {{{dl.pagePostType2}}.includes("single-") && (TimerDynamicSetting.customtime += 1000 * Math.floor(document.querySelector("#main").innerText.replace(/(^\s*)|(\s*$)/gi, "").replace(/[ ]{2,}/gi, " ").replace(/\n /, "\n").split(" ").length / 228 * 15));} catch (b) {}
function dynamictimer(f){var a,b,c=TimerDynamicSetting.customtime;this.pause=function(){window.clearTimeout(a);c-=new Date-b};this.resume=function(){b=new Date;window.clearTimeout(a);a=window.setTimeout(f,c)};this.resume()}
function DynamicTimerStart(){TimerDynamicSetting.active=1;TimerDynamicvar=new dynamictimer(function(){TimerDynamicSetting.count+=1;TimerDynamicSetting.active=0;dataLayer.push({event:"TimerDynamic","TimerDynamic.count":TimerDynamicSetting.count,"TimerDynamic.repeat":TimerDynamicSetting.repeat,"TimerDynamic.customtime":.001*TimerDynamicSetting.customtime});clearTimeout(TimerDynamicvar);TimerDynamicSetting.count<TimerDynamicSetting.repeat&&DynamicTimerStart()})}DynamicTimerStart();
document.addEventListener("visibilitychange",function(){"hidden"==document.visibilityState?1===TimerDynamicSetting.active&&TimerDynamicvar.pause():(dataLayer.push({event:"visibilityChange.on"}),1===TimerDynamicSetting.active&&TimerDynamicvar.resume())},!1);