Which watch? Some do have a built in time and stopwatch.
On other's I do think there are times in the app store. The thing with CIQ based, is they have to be running in the foreground - you can't start a timee, go back to the watchface, and have a notification when it expires. Check for "A" type apps for your device.
Long press up, then clock and timer.
I believe the Fenix 5S should have a handful of customizable "hot keys". You can probably configure one to go directly to the timer.