Entry Clearance - spouse

I received entry clearance for spouse. its valid for 2 years and 3 months. I have few questions:

1. when does the 2 year period begin - the day I enter the country or the day visa was issued?
2. within how many days i need to enter the uk from date of issue
3. how many days i can stay out of uk during the 2 year period.

I will really appreciate someone can answer these questiosn for me. thanks

yanga

you can enter whenever you want and the 2yr period towards ilr begins when u land