|There are no seconds in 1020 kb. Seconds is a unit of time Kb are a measurement computer data units. It is like asking how many hours in a gallon of water if a pump is pumping it at 10 gallons an hour.|
1024 kb per second will send 1024 kb in one seconds using a medium with a bandwidth 1024 kb. Twice the bandwidth will half the time. Bandwidth is measured on how much data can be transmitted in one second. Just like a water pump can be classified as to how much water it can shift in an hour.
Whether you can do that is dependant on the bandwidth of the medium you are sending it through. 1024 kbs could take two or three seconds of it could take a few micro seconds. Twice the bandwidth will half the time. Half the bandwidth will double the time.
1024 kb per second, or 1mb per second, the same thing, is actually quite slow even for the slowest Internet connection.