When does the period for wiping over leather socks (khuf) begin, and what should one do when unsure whether the wiping began while travelling or while resident?

Summary

According to the majority of scholars, the wiping period is counted from the first hadath after putting on the khuf, lasting one day and night for a resident and three days and nights for a traveller. If a person wipes as a resident then travels, or the reverse, the Shafii and Hanbali scholars treat the period as that of a resident, while the Hanafi scholars differ by circumstance. When in doubt whether wiping began during travel or residence, the Hanbalis say to hold to the certain case, the resident's period, while the Shafiis say wiping is not allowed and one returns to the original ruling of washing the feet.

Written in our own words from the original fatwa — check the source before acting on it.