Amazon India (Seller: Clicktech Retail Private Ltd )
I connected it for a few hours then turned off electricity. It last 4 hours and 40 minutes. All LAN ports were being used. Both 2.5Ghz and 5Ghz wifi were on. A lot of devices are connected and one connection also connects to a network switch which in turn has a lot more devices for themselves. I am not making an excuse but I am unsure how much effect those huge number of devices causes.
However, be that as it may, the rated time is shown as 8 hours and I got a little over half 4:40. I just realized that the amazon page says the battery of 8 hours is with a 1A adapter. I haven't checked how much my JioRouter is still.