Hazrat Sha'bi says that wiping over the socks is done once.

Hasan says that wiping over the socks will be done once.

Sulaiman narrates that Ibrahim performed ablution and wiped over the socks once.

Hazrat Mughirah bin Shu’bah narrates that I saw the Messenger of Allah (peace and blessings be upon him) urinate, then perform ablution, then wipe over his socks in such a way that he placed his right hand on the right sock and his left hand on the left sock, then wiped upwards once, as if the marks of his fingers on his socks are still before me.