The times I have truly "passed the threshold" during meditation I have successfully been able to concentrate and be calm for hours afterwards. Usually the rest

The times I have truly "passed the threshold" during meditation I have successfully been able to concentrate and be calm for hours afterwards. Usually the rest of the day. The times that this has occurred have been few and far between and this was when I was meditating every day for at least 10 minutes. Sometimes up to 30. It's hard to do, especially at first, but yes I found it to be effective. Then I had kids and didn't sleep for a year and anytime I tried to meditate I fell asleep. I still do it from time to time but it's rather cumulative. The more daily the practice, the more useful it will become IMO.