How much data will you lose during a speed test?
The data that you will lose during the speed test depends on your download speed. if your download speed is high, the amount of data you will lose will be higher.
In my case, my speed is 58 mbps and I've lost 195 mb for that.
so. approximately i will lose around 200 mb for every time i run a speed test on fast.com.
Some people keep on checking their download speed and hence lose all their data without knowing what’s going on.
I hope this will benefit you inshaAllah.