soak time ---15-20 minutes.
Not too warm.
Make the temp of the water comfortable to your wrist.

What substrate do you have in his enclosure?
What is the temp of the enclosure?

Some photos of your frog will help us.

Actually, could you please answer these questions

1-size of enclosure
2-# on inhabitants - specifically ( if there is another frog ---size differences ?)
3-humidity
4-temp
5-water - type - for both misting and soaking dish
6-materials used for substrate
7-enclosure set up i.e. plants( live or artificial) wood, bark etc -how were things prepared prior to being put into the viv
8-main food source
9-vitamins and calcium ? ( how often )
10-lighting
11-what is, specifically, being used to maintain the temperature of the enclosure
12-when is the last time he ate
13-have you found poop lately
14-a pic would be great ( including the frog ) any little cell phone pic is fine
15- how old is the frog
16-how long have you owned him
17- is the frog wild caught or captive bred
18- frog food- how often and if its diverse what other feeders are used as treats
19- about how often the frog is handled
20-is the enclosure is kept in a high or low traffic area
21- describe enclosure maintenance ( water changes, cleaning etc)
22- has or was the frog quarantined

Lynn