The Nikon D3400’s Live View turns off after 10 minutes by default; you can extend it (to a point) under the Auto Off Timers setting — the exact steps are below, including the webcam-use catch.
By default, the Nikon D3400‘s Live View will turn itself off after 10 minutes. One place that can become a problem is if you’re using the D3400 as a webcam.
But it’s possible to adjust this, at least to some extent.
You can bump that up to a maximum of 30 minutes.
You can find this setting under:
Settings > Auto Off Timers > Custom > Live View > 30mLike this:
