What is the resolution of Watchdog timer (WDT) in the WDT controller?

[Henry]

WDT includes an 18-bit up-counting WDT counter that supports 8 timeout intervals and its clock source can be set to 10khz or HCLK/2048.
The timeout interval can be set to overflow from bit 3, 5… or bit 17. If the clock source of WDT is 10khz, the smallest timeout interval is 1.6ms (2^(3+1)/10k) and the largest timeout interval is 26.2s (2^(17+1)/10k).