Affirmations, how to get best results?

I was wondering, what is the best timing for using Affirmations?
I read somewhere that you should go over an affirmation for 2 minutes at a time each day, and it's good to use about 2-3 affirmations.
To be more specific;

- If there a specific time of the day that affirmations work best, such as just before you go to sleep to give it time to sink into the mind, or in the mornings to start our daily rituals?

- They say 2-3 affirmations, should these be done together in periods of 2 minutes, or spread those 2 minute sessions throughout the day? Or in regards to my previous question, the main/more 'important'/preferred affirmation at that specific time and the other at a different time?

Thanks,
Howie