As someone whose PlayStation Plus subscription is just about to end, this is just perfect timing.
Daddy's gonna be playing Overwatch this weekend. A LOT.
The free period kicks off at 7pm on Friday evening until 7pm on Monday. That's three whole days of free PlayStation Plus.
Worthy of note: the PlayStation 4 has recently released its v3.55 update, so you might want to get that downloaded in advance if you want to make the most of that sweet, sweet free PlayStation Plus time.