Jesus Mary Joseph and the Wee Dpmkey !
Would you do this too your hands? No !
An hour is way too long to soak your feet , you'll be like a prune .
Get a file , not a cheese grater sharp one , look at something like Margaret Dabbs .- use it dry every 3 days or so (she's often a guest on QVC if you look up the products )
Use your Flexitol daily after a short (10 minutes) foot bath
Give it a month to get best effect
I'm not trying to scaremonger but the skin on the feet is tough for a reason. Your job is to keep it clean and elastic so well moisturised . If you remove it your skin will replenish it .You risk damage by over zealous removal and you can leave uneven, over reduced areas
Find out WHY you are getting all this callus .
Dryness-mpoisturise
Pressure-remove the pressure . Critical look at your footwear
See a Podiatrist , ask advice from them. It'll be the best £40 (ish) you spent