I am unable to upgrade the software to 13.6.1
I am unable to upgrade the software to 13.6.1 , when I am trying to update. Page just remaining like this. Please check the attached screen shot. Not updating- just remaining as Estimated time remaining
You omitted the most important part of your screen - the top.
Are you on wi-fi? That is required.
If your iPhone, iPad or iPod touch won’t update - Apple Support