Beta Updates Questions

[Suvodeepbiswas]

I have some questions about the beta update:

i) How many days or months will the beta update run?

ii) After how many months will the stable update come after installing the beta? 

iii) Is there any specific date for releasing the stable update of the A series?

iv) After which series does the A series get the beta update and the stable update?

Please answer the questions 🙏