1TB at 15Mb/s
Assuming "at" is referring to computer science | Use as instead
Assuming megabits per second for "Mb/s" | Use or instead
Assuming terabytes (base 10) for "TB" | Use instead

Input information

data transfer | 
data | 1 TB (terabyte)
data rate | 15 Mb/s (megabits per second)

Result

time | 533333 seconds
= 6 days 4 hours 8 minutes 53.33 seconds
= 8889 minutes

Equation

I = R T | 
T | time
I | data
R | data rate