This is period #1135. Period #1136 will start in about 11 hours, when the unix time 1374560000 % 1210000 == 0.
is it 1210000 or 1209600(14*24*3600)?
It is 1,210,000 so the activity period is actually 2 weeks 6 minutes and 40 seconds. Hence the day of the week which activity increments changes over time.
so the period will start next Tuesday.