How many seconds would it take for my 20,000 ton kaiju to come to a complete stop from 15 or 30 mph?

I have a bipedal kaiju-style monster that walks upright on two legs and weighs 20,000 metric tons. Supposing, of course, that it can carry its own weight, its muscles can support the stress, and the ground can support it, does anyone have any idea how to calculate how many seconds it might take for this creature to decelerate from the respective speeds of 15 and 30 mph to a complete standstill?

I tried using freight train emergency braking times as a reference, but I imagine the two stopping methods are very different and therefore might yield very different results.

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How many seconds would it take for my 20,000 ton kaiju to come to a complete stop from 15 or 30 mph?

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