Best way to upgrade walls?
Hey everyone so I'm upgrading one of my teslas to lv 6 and there is 6 days left and I want to do level 8 walls for the remanding 6 days they are 500k a wall. So the whole 6 days should I save up and do a bunch of walls at one time when the tesla is done. Or every million should I do 2 walls? Im worried that if i try to save for the six days ill get a ♥♥♥♥ load stolen but I don't really like having 1m loot then going to zero loot. Just looking for opinions here, what would you guys do?