1st week
39M OW (10.6M Sun)
3.2M Mon (-70%)
4.8M Tue (+50%)
3.5M Wed (-27%)
3.5M Thu (+-1%)
= 54M gross
2nd weekend
7.9M Fri (+125%)
11.8M Sat (+50%)
5.9M Sun (-50%, Christmas Eve)
= 25.6M 2nd weekend (-34%) = 79.6M gross
8 days holiday stretch
Each day performing as a Saturday, in this case previous Saturday 11.8M. Let's say averaging 10M each for 8 days => 80M
End of holiday total gross = 160M
Jumanji 2 added 10x its New Year's Day gross after this point
Jumanji 1 added 13.5x
Puss In Boots 2 added 22x
TGS added 22x
Mary Poppins Returns added 6.7x
ITSV added 12x
Alvin Chipmunks 2014 added 5.5x
It's kind of all over the place so I'd go for 10x = 100M
So, totalling 160 + 100 = 260M
Hmm, so maybe closer to 250M than 300M, but I think OS will be good enough for 700M WW.