At what temperature does water start to scold skin

the temp time plot according to johns hopkins university

temp ----- 1st deg burn ----- 2nd deg burn
44C-------- 300min------------- 420min
47----------- 35-------------------- 45
48----------- 10-------------------- 14
50-------------1--------------------- 5
55------------- 0.083-------------- 0.417
60------------- 0.033-------------- 0.050