Beat Magnus Carlsen?

How long do I have to train to do this?

You are at 1200 online standard right now

So that is around 2 years of study/play for a IM, maybe one more year for becoming GM, and another year for reaching top ten. Around 4-5 years, maybe only a year or two if you work really hard

Give him 5 billion dollars for him to resign in private.

You'll never beat Carlson so just give up.

Yeah..no

There is a way:

1. Create a imaginary friend called Bob .

2. Seclude yourself in a place that you can survive for 5~10 years.

3. put a 10 hours video of rainbow bunchie.

4. now repeat the video for the next years while you google every chess's piece of information you can find at google, and after that play against bob at least 10000 games of 90 minutes and 30 seconds increment(DONT FORGET THE CLOCK!).

5. you need to marry bob.

6. Bob is Love, Bob is Life.

7. Change your name to betty.

after that you can start OTB and pave your way to be the biggest legend in chess that did ever exist, carlsen will not be a match for you.

Some of these responses are more supportive than others.