How long is Halo 4's campaign (in-game)

Games Other Halo
1

I began wondering this while playing through the complete MCC with my friend, when I thought of a joke. Before I could make it I had to figure out the amount of earth time that passed between the beginning of (Halo 4) Dawn and end of Midnight. I scrapped the joke and started thinking, I thought for a while and used different methods while doing some research but no answers seemed right. So I ask you all how long you think (in earth time) It takes the Master chief to go from the drop pod on the dawn to the composer where he detonates the nuke. Please explain your answer in the discussion. Thank you.

(P.S. one of the best answers i came up with was 1 earth day. This is because it would not be too unreasonable since Master Chief hurries through the whole game and never stops fighting, plus he wouldn’t have to travel far because of portals. Also even though we go through more than a day in the game, we move throughout space AND do not know how many hours are in a day on Requiem. I realized this when thinking “the first mission is dawn, and the last is midnight, A full day!” I did a bit of looking and this seemed to be one of the best answers I could come up with. Although if you still have a more valid answer or an opinion on the theory then I encourage you to tell) Thanks again.

2

I think it took about 7&1/2 (Earthean)days or almost two weeks.First he was on Requiem which seemed to take about 1 day. then He escaped and made it to a strange planet where he discovered the knights and suppressors which had me take a long time on easy which always seemed to be a dark planet so it was hard to tell what time it was when he arrived but I would say about 1&1/2.When he finally got past that and to the jungle-like ship I would say the crashed ship would take about 3 days with the covenant and prometheans teaming up as one force and having to leave the planet and having to escape.The race to the halo was insane though it felt like 1/4 a day because it was likely that that mission was not a full rotation(judging by earth time) but instead merely a fourth.but When Chief raced through the metal planet like orb in a fighter ship and killed the didact it seemed to be 1&1/2 based on all the tasks completed in one, leading to my 7&1/2.