In my summer vacations 3 years ago (I think) I started reading Katekyo Hitman Reborn. After I read through the entire manga in 2 days I was unsatisfied because they were still in the future arc with no hope of getting out of there anytime soon.
So I looked for a new jump-manga to read and found Gintama.
I started reading it and (after I realized that I had tried to read it years ago and was impossibly bored by the first few pages, that I dropped it then) well... I found it a bit boring.
But really, I learned from quite a few mangas to just cuntinue reading because they will keep on getting better after some time
I needed the rest of my vacations (5 1/2 weeks) to finish it.
Sometimes the chapters are so boring one does not want to read on...
But somehow I am still on it and it somehow became my favourite manga (& anime).
So basically I found Gintama because I was bored enough to read the first pages of the manga.
And I'm glad I did!