I probably spent 7 hours on application paperwork for my current job. Complete with detailed personal history that had to be 100% accurate going back 10 years.
I had 3 other offers expire before I got my offer from my current employer. Then once I accepted it was another month before I knew if I passed the background checks. That wanted me to start a few days after I finally knew without giving proper notice to my current employer too!
Thankfully this only had one 3 hour casual interview and it was more a waiting game than endless hours poured into interviews for a job I might not get. I knew this would be a better choice than the other offers and I'm glad I did what I did.