Slow shutter speeds with Lr camera

[PhotogCda]

Is it possible to generate slow shutter speeds (e.g., 10, 20, 30 sec) with the Lr camera?

I've opened the camera, set it to Professional mode and when I tap the shutter speed icon, the slowest I can set is 1/10 sec. 

I want to do some night photography with the phone (Galaxy Note 9) and need slower shutter speeds.

Thanks.

[Jao vdL]

It depends on the phone but you should see a "long exposure" mode in the popup menu left of the shutter button. This works differently from a traditional long exposure because it averages frames instead of just exposing longer but should get you the desired effect.

[PhotogCda]

No, I don't have that option. I can get up to 10 sec (albeit at a max ISO 800) with the stock Samsung camera app, but only 1/10 sec with any 3rd party app. Very odd.