Offline time before becoming an available target.
It would be nice to have 5 minutes from the time you are disconnected to the time you can be attacked.
Example: Last night I was farming to get the last 200k out of 2.25m of elixir required to do research lvl 5 and I turn my screen off went to the bathroom came back ~1-2 min latter and I get the screen please wait 3:30 your village is under attack. and lost 230k Elixir/gold.
This is just 1 example in the past this has happened 3 times in 1 night.
It makes it really hard to reach high elixir goals 2 million + for my level since you have so much elixir already saved up you become a prime target. So the only way to save up is to never disconnect from server.
I feel that 5 min is a good time from the time you get disconnected until the time you can get attacked.
That leaves you enough time to Run to the bathroom, make a quick sandwich, Answer a quick email, Kiss and hug your partner so they do not feel left out, grab something out of the car , answer the food delivery guy and pay him etc...