How long should you exercise to lose belly fat in 3 weeks?

I don't go to the gym.

I do an hour of walking each day which gets me about 7k steps.

I'm on work Christmas break for 3 weeks & want to lose belly fat in that time.

I know to cut sugar out of my diet & junk food out.

Are there any good youtube ab trainers?

I've been doing Chloe Ting at the moment.

I want people to notice I've lost weight when I go back to work.

How long should you exercise to lose belly fat in 3 weeks?
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