Simple mod that makes any hunting horn buffs you receive last forever. This does not work for other people, only those with the mod. So if you get buffed from the hunting horn and have the mod, it lasts forever, but if somebody else does not have this mod, it will last the normal amount of time for that person.

You must have Fluffy's Mod Manager 5000 in order for this to work, unless you are using the .pak (not recommended).

To install the mod using the mod manager, go to the install location of Fluffy's Mod Manager > Games > MHRISE > Mods and drag the folder (the folder outside of natives) inside the Mods folder. Make sure that the mod is enabled in the mod manager before launching the game.

To install the pak version, extract the .pak file from the download into your Monster Hunter Rise folder directly. The file will have the name "re_chunk_00x.pak.patch_00y.pak". Rename the file to have a 0 instead of "x:. Make the "y" part of the pak file name correspond to whichever pak you are installing. For example, if this your first and only pak then you would rename the file to "re_chunk_000.pak.patch_000.pak". For every pak you install you will increase the value of "y" by 1, so if this is your second pak then you would name it "re_chunk_000.pak.patch_001.pak" and your third "re_chunk_000.pak.patch_002.pak" and so on.

WinRAR or 7Zip is required to extract the files.

BACK UP YOUR SAVE

While there should be no reason this will corrupt or invalidate your save file, always back up your save before installing any mod that changes the game like this.
Join my Discord server, you can ask questions here about mods and get help troubleshooting. Read the pinned message in the mod-questions channel before you ask for help.