It's hard to give an exact time. It depends on how you progress through the game and complete various quests and missions.
The story of MHW ends when you've accomplished all the key objectives and wrapped up the main narrative arc. However, some players might consider it over at different points based on their own gaming experience and goals.
Chapter 313, ", The Cradle Project", is the clearest early answer because it turns Divine Emperor's situation into a concrete plot event. A useful checkpoint is the way the scene starts with [Mage Academy: Once you have built an academy dedicated to teaching... and follows through with Unless they are so-called 'Untouchables', completely Subspace....
Chapter 189, ", Allied Air Force, Ace Pilot Requests to Enter the Battle!", is the clearest early answer because a shaky connection becomes usable in the plot. A useful checkpoint is the way the scene starts with The laser cannon melted away a part of their massive bodies; 40mm... and follows through with how?" Jason Morgan asked, puzzled beyond measure..
Chapter 300, ", Battle for Command Authority", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter gives readers a real answer by opening on Gu was on Korolya III, coordinating with a joint investigation team... and ending on However, what Cai Minjin proposed next was something Yan Fangxu could....
Chapter 172, ", Work Report", is the clearest early answer because it turns Green Skin's situation into a concrete plot event. It opens with While thinking about the matters concerning Blackbird Heavy... and closes on In actuality, anyone below E-grade had no human rights..
Chapter 182, ", The Technical Expert You Wanted", is the clearest early answer because it turns Wu Jiarong's situation into a concrete plot event. Early on, Gu Hang could not let Wu Jiarong abandon her work.. By the end, A bowl of thin gruel to last a day.. Inside the broader power growth storyline, the chapter closes with It wasn't difficult;
Chapter 179, "No Need to Worry About Imperial Tax at All - Part 4", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. Early on, This was Gu Hang's eighth month on the planet's surface.. By the end, The two parties had several rounds of negotiations on this matter.. Inside the broader battle storyline, the chapter closes with This chapter is also 6000, which gives battle a stronger narrative position and pushes the trade and resources onward.
Chapter 237, ", Can I Also Ascend to Godhood?", is the clearest early answer because it turns Gu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with They might not understand much, but seeing Mr. and follows through with to ascend to 'godhood' by means of the body of the slain Evil God?. By the close, Her softened attitude, the assistance she spoke of, paradoxically..., and the chapter closes with Or...
Chapter 178, ", This is the Reward of the Divine Emperor", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from The rules are the same as the 100-tier, after getting a hit, the... to Furthermore, this exploration team will also develop a comprehensive....
Chapter 249, ", Hold for 8 Days, the Governor Will Arrive", is the clearest early answer because it turns Count Drex's situation into a concrete plot event. Early on, With its leg broken, the integrated perception module in its head.... By the end, And at the front, he had seen Count Drex, who was once on an equal....
Chapter 175, ", Central Blossom Army Corps", is the clearest early answer because it turns Loyal Heir Academy's situation into a concrete plot event. The chapter gives readers a real answer by opening on After personally experiencing the enhanced level of teaching provided... and ending on The Morgan Couple and their sister Milia were all selected for the....