Are u all singing better after 30 days? How long should I practice every day? Just one course 15min per day? Is it enough? Can I do 3 per day?

What do you suggest? Also what about the part in the course that's a bit out of my range, can I use falsetto? or just not do it at all

We recommend one lesson per day, but please keep practicing with song work if you're feeling good and have more time to spend! And as for using falsetto, go for it! Please see below:

https://www.30daysinger.com/blog/one-lesson-per-day-how-to-practice-for-the-best-results

https://www.30daysinger.com/blog/how-to-choose-and-work-on-a-song