Tracks, scrapes, kill sites, etc. Males in particular will scrape the dirt to mark territory. Kills are generally unmistakable (buried under bushes, covered with leaves, etc). However, hounds are indispensable during summer and fall, given their extraordinary olfactory capabilities (~50x more receptors in their noses than ours) that can detect lion scent days after the lion passed through. Hounds don’t need to see tracks or anything, just smell what’s been there and they can track it. I used to run trap lines, but hounds can do in 2-3 days what takes me 2 weeks using traps.
Time reflected above is 3-4 days/week for consecutive weeks. Can typically work the hounds that long before they need a couple days off for R & R.