Duke-of-Ed hours counting bookmarklet

bookmarklet.js

for(var el=document.getElementsByClassName("_177ZgO_Z8JZy-fXhmTlSfO"),t=0,a=0;a<el.length;a++){var h=/(\d+)h (\d+)min/.exec(el[a].getElementsByClassName("_1DFESbLyOveW60ihEafsZr")[1].children[0].innerHTML);t+=parseInt(h[1])+parseInt(h[2])/60}alert(t+" hours done, averaging "+parseInt(t/parseInt(/Completed (\d+) h/.exec(document.getElementsByClassName("qa1iBqTdHVMA1IjYvmNIs")[0].innerText)[1])*1e4)/1e4+" per week");