@LeRoy12358: The game caps depletion at 32. If you are producing over 32, you do not need to build any more production capability. My earlier survival maps had absolutely every spot covered with either a weapon, storage or production. Build production to just past 32 and put the rest into weapons in layers if you are going for max time alive. Good luck.
On 5/9, I started at the North side and built everything from there. Got 1 upgrade as the SAM was built. Then a 2nd Odin City move to activate the final Southern totem. Still don't know how hawk45 took 14 seconds off that time. I took a few shots at going directly to the center, but my times were worse.