I went from 1 to 50 hunter in a single day on my ironman to be fair. 60 hunter doesn't take long to get at all after the initial slow levels.
Not sure about slayer because I'm not an efficient with it.
57 fishing can be gotten in a less than a day easily. You can go from 1-28 just by doing Sea Slug and Fishing Contest and Pirate Pete. Then powerfishing trout/salmon which would take 7~ hours from 28.
59 agility can be gotten in a day most likely as well. I quested from 1-42 on my ironman and coudlve grinded more that day. Tourist Trap 1-26, Grand Tree 26-32, Troll Stronghold 32-36, One Small Favour (2x 10k xp lamps) 36-41, Recruitment Drive 41-42. 42-50 would take 4 hours. 50-59 would take around 12-13 hours. So can be gotten in a day if focused solely on these quests and training.
Mining easily in a day. 1-35 with Dorics Quest, Plague City, Digsite, Lost Tribe, then powermining iron. Powermining iron is 50k~ xp an hour once you get rune pick. Which would take 5~ hours or so to get to 60 from 41.