7 days seem a bit much. I will likely get my matches done in time, but if others need some, 3 more days will include next week's weekend.
3 days would only reach beginning of weekend. But 4 or 5 could work
Maybe those 3 days were calculated based on the original timer above phase 2 matches, which is not the actual match timer. As the OP here makes clear, Monday 14 October is currently the last day of matches. Adding 5 days makes that Saturday 19 October.
For me, this would change nothing, since my availability on that Saturday is non-existant.
Then again, it's mostly everyone else that needs to play their matches.