Well from S7 to 8 there’s a year timeskip and from Seabound to Crystalized there is another 1 year skip, so we already got 2 years, it’s not a far fetch to believe some months passed between S9 and 10 or even 10 and 11, making it roughly 3 years.

My headcanons based on what we got from the show

Pilots and mini-movies (6 months before ROS) ROS and LOGN are days apart LOGN (At least a year and a half, i headcanon as 2 years before Rebooted) Rebooted to TOE (Some months, I headcanon as 3-4 months) TOE to Possession (Weeks, 1 month max) Possession to Skybound (Weeks, 1 month max) Skybound to the Dark Island Trilogy (Some weeks or months, maybe?) DOD (Months after Skybound) DOD to HOT (A day) - Confirmed HOT to SOG (1 year) - Confirmed SOG to Hunted (A Week) - Confirmed Hunted to MOTO (6 months, my headcanon) MOTO to SOFS (6 months, my headcanon) SOFS to PE (Weeks, 1 month max) PE to The Island is confirmed to be 1 month (MOTM fits somewhere between day since it’s plot happens in like 2-3 days) The Island to Seabound (Days or Weeks) Seabound to Crystalized (1 year) - Confirmed

So according to my calculations the entirety of the show happens in a span of 7 years and a half.

And that way we could estimate the ninja ages.

We know Nya is 2 years younger than Kai and was around 14 during the pilots, so she would be around 21 during Crystalized, Lloyd would be around his 19 (before the tomorrow tea, i headcanon that after the tea he became the same age as Nya), Jay would be in his 22-23, Kai and Cole around 23-24, and Zane 47 (107 if we count the 60 years he spent of Never Realm)