Indeed a good question.
Let’s have a look at the facts …
Android 10 was released on 2019-09-03 and is available since 2020-09-07 (was a Monday) for the FP3.
We may assume …
Android 11 was released on 2020-09-08 and may be available on 2021-09-13 (it’s a Monday) for the FP3.
Now given the bad (inexistant) communication about Android updates / upgrades on the part of Fairphone …
… and possible COVID-19 mutation / appearance of new COVID-21 exuse for the delay (not communicated either) we may expect a divergence of +/- 6 months on the forecast.
I didn’t had the reboot problem as others have but since the Android 10 upgrade it already rebooted 4 times without any reason 