Agree with Abhishek about extension tubes. I also use extension tubes. Unlike you guys, I can't crop as I am filming and even in still photography I rarely crop.

Extension tubes will help you in getting more than 1:1 magnification.

How much time it takes to insert the extension tube?

Macro photography and filming needs very careful and deliberate approach. It is not like roaming around in a Safari in a jeep for few hours and then returning back. Slow approach helps. Also, unlike you guys I use tripods 100% of the time (with the 100mm IS macro lens). So you can imagine how much slower my approach would be from you guys. At the end of the day, when you get one great macro shot, close, perfectly composed with right depth of field and light, it is worth more than running and firing 20 OK shots.

Will post in detail later when I can share screen grabs.