SystemParametersInfo
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SPI_GETKEYBOARDDELAY:
Retrieves the keyboard repeat-delay setting, which is a value in the range from 0 (approximately 250 ms delay) through 3 (approximately 1 second delay). The actual delay associated with each value may vary depending on the hardware.
0=250ms
...
3=1000ms
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SPI_GETKEYBOARDSPEED:
Retrieves the keyboard repeat-speed setting, which is a value in the range from 0 (approximately 2.5 repetitions per second) through 31 (approximately 30 repetitions per second). The actual repeat rates are hardware-dependent and may vary from a linear scale by as much as 20%.
0=400ms
...
31=33ms
alles so in etwa, da es nach Hardware abweichen kann.