Correct import settings to suit 1080 YouTube use?

Ok, so working backwards from the preferred export settings, my content is designed for YouTube and I guess we'd still like to have a quality image at 1080X1920 when viewed on TV (for those who still do which is most of my audience).

I'm finding my export times are too long and want to try and cut that down. If I can get my settings right from the start to be suitable for my video purpose, I figured this would cut back on my export time?

I film at either 25fps or 50fps depending on the light source at the time.

I'm recording XAVC S HD footage. (I know I don't need 4K)

At the moment my import settings into PP are AVCHD 1080 at either 50fps or 25 fps, matching the footage.

I'm creating long form video for YouTube with heavy colour correction and 4K overlays (that's how they come from purchase).

I'm rendering the clip before I export but am finding a 30 minute clip is taking over 20 hours to export either matching import settings or high bit rate.

Any insight would be much appreciated.