Forgot to add the timeline - should take about 2 seconds to load the shifter - so hit the switch, wait 2 sec, then unload the drivetrain.
If you have an automatic or one that has the little 'lo'/'hi' lights on it, these are controlled by the actual movement of the shift fork, **not** the motor. So it is entirely normal to hit the shift button and have the indicator stay in the same gear until you unload the drivetrain.
There's no limit on how lo0ng you can drive with the spring preloaded - that is you can hit the shift button and then not actual unload and shift for a bit if you need to for some reason. I would recommend against doing this any longer than you have to as it will put a load on the shift fork and cause wear, could suddenly shift when you don't expect it to, or could theoretically pop out of gear causing damage. Sort of like driving down the road pushing on the shifter on a stick - not good for things, but not a crisis either.
Important to note that the US Gear/ DNE2 (same basic box) are *either* under/direct, *or* direct/over. So you either get a higher top end or lower 1st and can split the gears in between. GV is a over/direct only, despite the "under/over" they advertize.... to me this is pure bs on their part and is one reason I really don't much like them.