Considering it's only been a week (i.e., lockouts have only reset once), I think the time remaining on the lockout screen should corroborate the time killed.
fyi lockouts quite often bug. Although time remaining seems to be consistent.
Personally i'd like to see screenshots of raids to ensure at least 75% of a raid are guildies. Otherwise i wouldn't consider it a guild kill. But that's just my thoughts on it.