A.T. Robertson Commentary Luke 17:4

"And if he sin against thee seven times in the day, and seven times turn again to thee, saying, I repent; thou shalt forgive him." — Luke 17:4 (ASV)

Seven times in a day (επτακις της ημερας). Seven times within the day. On another occasion Peter's question (Matthew 18:21) brought Christ's answer "seventy times seven" (verse 22), which see. Seven times during the day would be hard enough for the same offender.