TM more than twice a day?

Hey, I was just curious. I have a lot of times in the day where I forget to do TM in the morning, or I do TM at night or in the morning and I want to do it for more than 20 minutes, or even though I did it in the morning and night throughout the day if I’m stressed or angry I want to do it again but for some reason we are limited to only 20 minutes a day twice a day. What’s ur thoughts on that and do you guys do more than that? Plz let me know