Yes (but of course it's different for everyone). To me, meditation is an act of removing yourself from the daily grind. But if you stay removed indefinitely, you become desensitized to the powerful impact of meditating.
It depends. To staying focused at the beginning, there can be. But you can keep trying for as long as you want in a session. The most important thing is to make it a habit and try to incorporate mindfulness into your day to day life.
You’ve got to get there out in the world and actually experience using the fruits of meditation in your daily life… It’s no good to prepare and prepare and never go into the battle