Looking at the current series, it started at 6.5 in early October and if it lasts untill the beginning of 7.0 we're looking at something like 8 months.

But if they add a new series at around the beginning of February, we would have current series for 4 months, and then around 4 months for the new series. This could help keep people engaged in PVP if there's a new battlepass to grind out.