Affirmations are a powerful tool for reprogramming habits of thought, letting your subconscious brain know you want to change something. It's a bit of a 'fake it till you make it' approach, and your brain will do everything in its power to bring that new reality into being. However, the question of how many times you should repeat affirmations varies depending on your specific goal. For example, you might need to say them more often than others if you're trying to boost your self-confidence in preparation for an important presentation.
The best practice is to find a time of day that suits your schedule, and stick to it. Mornings tend to work well, because they can help set the tone for your whole day, but some people prefer to do them at bedtime, too.
In addition to picking a time that works for you, it's also helpful to write your affirmations down. This allows you to commit them to memory and reread them throughout the day, which can make them more effective.
Some experts recommend saying your affirmations out loud, rather than in your head, as this helps your subconscious mind connect with them. Ideally, you should say them as slowly and clearly as possible, and focus on each word, feeling the positive energy that goes with them.
The more you focus on your affirmations, the more likely you are to believe them. You can try to commit them to memory by writing them on notecards and placing them around your home, or keeping them in your notes app on your phone. You can also set a daily reminder to repeat or reread your affirmations so you don't forget.