I don't understand why everyone tries to make this so complicated. You need frequency and duration. There's not other way about it. If you expect to progress, you have to practice often and for significant periods of time. There are no shortcuts. Monks from the time of the Buddha to the present day would sit for hours, everyday. It's curious to me that laymen today think they'll be able to get away with less. If anything, they'll have to sit more often to combat the stresses of a householder's life!
Don't worry about when you sit. While mornings are generally best, all that matters is that you are practicing. If you're looking for a number to shoot for, aim for two hour long sits everyday. While more is always better, if you can manage this much, your practice will drastically improve.
A little snark from J.D. Salinger to help you on your way -
"I don't want you to go away with the impression that there're any-you
know-any inconveniences involved in the religious life. I mean a lot
of people don't take it up just because they think it's going to
involve a certain amount of nasty application and perseverance -you
know what I mean."
It was clear that the speaker, with patent relish, was now reaching
the high point of his address. He wagged his orange stick solemnly at
"As soon as we get out of the chapel here, I hope you'll accept from
me a little volume I've always admired. I believe it touches on some
of the fine points we've discussed this morning. 'God Is My Hobby.' By
Dr. Homer Vincent Claude Pierson, Jr. In this little book, I think
you'll find, Dr. Pierson tells us very clearly how when he was
twenty-one years of age he started putting aside a little time each
day-two minutes in the morning and two minutes at night, if I remember
correctly-and at the end of the first year, just by these little
informal visits with God, he increased his annual income seventy-four
per cent. I believe I have an extra copy, and if you'll be good