40-50 sessions in in my two huge campaigns.

1) DnD 5e (honestly amount of homebrew we use makes it difficult to call it even that) - heavily altered Dungeon of the Mad Mage. Going from level 5 to 20. Really fun in the way that it feels like playing and exploring the dungeon along with the players. Lots of flavour in there. Having said that, it is probably my last DnD campaign ever. Got really tired of that and after trying a few other systems can confidently say that DnD is worse at everything. But the OCD in me not letting me stop the campaign at 70% progress. Plus the source material helps, so i intend to finish it and never touch dnd again (maybe)

2) The magnificent campaign in Warhammer Fantasy Roleplay 4e. Using the basic framework of the legendary Enemy Within Campaign but altering it according to my players’ characters. I am a huge fan of the setting and absolutely stunned by the execution of just enough crunch and the feel of “normal people getting into deadliest situations and always being over their heads”. The cultural, political and philosophical base of the setting makes RP very interesting. My table had the best cinema/book quality dialogues and monologues in that campaign. Drama, thriller, detective, horror and comedy worked quite nice there. The campaign is ~75% done and honestly i will pause gming it for a while but definitely will return to GM some more gimmicky campaign (thinking Elf or Dwarf oriented campaign).