Documentation on tooltip timings doesn't specify the unit

I'm trying to figure out how to do specific timings on my tooltips - open very quickly (but not immediate!). So I read the docs - https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.tooltipservice.betweenshowdelay?view=windowsdesktop-8.0#system-windows-controls-tooltipservice-betweenshowdelay.

However, this doesn't indicate the unit of measurement. Is this seconds? Milliseconds? I know this is likely milliseconds, but the documentation should specify the unit of time.