• you'll have to take a lot into consideration. The speed of sound is 344 meters a second in a vaccuum at a standard temp of 20 C. To determine the velocity of sound per its envioronment you need a bulk modulus.. v=SQRTB/p where p is the mass density. You can get complicated and factor for atmospheric pressure, temperature and such, but ultimately Hello yes your echo will be at least twice the time it takes to get to the point of its rebound, more is on account of teh angle.

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