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It all depends on the initial velocity at which you fell, and whether air resistence is present, etc.

If you are simply in a state of free fall, your time to reach the ground would be

d=100m

v1=0

a=9.8 <- acceleration of gravity on earth

t=unknown

d = Vi*t + 1/2 a t^2

100m=0*t+1/2(9.8) *t^2

100m=4.9*t^2

sqrt:(100m/4.9)=t

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14y ago

What else can I help you with?