Commit to at least 2 minutes a day. You can do it for 20 minutes if you feel good about it, but this month’s challenge is just about sticking through it. You’ll find it much easier to start this way, and forming a habit with a small start like this is a method much more likely to succeed. You can expand to 5-7 minutes if you can do it for 7 straight days, then 10 minutes if you can do it for 14 straight days, then 15 minutes if you can stick to it for 21 straight days, and 20 if you can do a full month.
Start by focusing on your breath. You can also use any number of meditation apps.