Without more context, I can't be 100% sure. However, "moment to moment" means that the situation changes constantly. For example, "My mood is moment to moment when I'm at work. If my boss is nearby, I'm tense and irritated, but I feel calm and relaxed when I'm left alone."

It's hard to be sure without more context but it sounds like the speaker is saying "I have the opportunity to do this on a daily basis (i.e. more or less every day) but not at any particular time during the day. Instead, I do it whenever the opportunity arises (from one moment to the next)."