Consider the following UART transmission:

Baud rate $=31,250$ symbols per second

Format $=1$ start bit, $8$ data bits, $1$ parity bit, and $1$ stop bit

Sampling frequency $=16$ times the baud rate

Calculate the maximum drift $($in nanoseconds, ns$)$ in the sampling interval that can be tolerated before the sampling process will sample an incorrect value.

Enter only the numerical value. DO NOT enter the unit.