questions on thc candy bars :)

hey i havnt ever made any but i was wondering why you have to cook cannibutter for a long time to get the thc out, but you just have to melt the chocolate for like 5 min and add weed then ure done?... and can i make them 1 bar at a time? if so wat would be the ratios?(i dont have a bar moulding pan) you can giv me scientific answers or just toking experienced answers... its all good

i made some cannabutter chocolate bars with a half cup of cannabutter which i used a half ounce to make then melted 5 bars worth down an melted all together. made some awesome bars absolute couch lock