is there a Limit to amount of times we can have in the config
I have 6 different time periods in Config and i select one to give to group Admin and one to give to group Default
But im noticing weird things happening such as removing the building im actually in the process of building even though i have the timer for admins set to 30 mins (remember this is 30 mins from when i log off - not when im still online)

this is the format i have it in 
{
"Permission": "autopurge.none",
"Lifetime": "none"
},
{
"Permission": "autopurge.1d",
"Lifetime": "0s0m0h1d"
},
{
"Permission": "autopurge.30m",
"Lifetime": "0s30m0h0d"
},

should i change the timer so it says "30m" instead of "0s30m0h0d"

it should be just 30m, should be fine anyways tho

i just watched the base i was building start to decay right in front of me
This plugin does not rely on the building have decay does it as i have NoDecay on the server and just wondering if somehow it is interfering with it

Make sure you are using the latest version and no plugins like upgrade / etc are replacing entity ownership. But I will take a look.