I shutdown my 1 TB Aura using the long remote power push at 2110 last night and left the Aura HDMI cable connected to the HDMI switch which had its input green LED lit. No other inputs were connected to the switch and nor was the TV HDMI cable.
At 0800 this morning I checked the set up and the green LED was still lit indicating power from the Aura.
I re-attached the HDMI cable to the TV and started the Aura.
The timing results to the HUMAX splash screen and to the Android Animation but the time to the Live TV was~17s longer.
As far as I can see there are no additional power-control settings available to further shutdown the Aura from the long-push remote control option.
Unless you know of other power-control settings the cause of the timing differences remain a mystery, though, of course, my Aura may well be defective and fails to properly go into deep-standby mode.