Watching videos is always best and it just takes few minutes on each video. But it depends on person to person either to watch videos or take its energy through VK.
Regarding time gap, there are no rules by Sharat Sir. If you like to watch you can do it back to back.
Some people have experienced very high energy from videos and they love to watch back to back multiple videos….they enjoy it.
Some people felt they need a break because of high energy , like for me earlier i used to feel giddy, so i took a gap of few minutes. But now i can watch it back to back.
Regarding the video to watch just before sleeping at night, that is generally your most important wish OR ONE TOPMOST PRIORITY thing that you want in your life now.
No video will overwrite the others.
Its just that your subconscious mind remains in that energy during the sleeping hours , so you can choose whats the most important video for you.