Maximum idle time
From Mysqlgame
This is the amount of time (in days) for which your account can be inactive before your rows become vulnerable to deletion.
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Calculation
Each Money Factory, Fuel Factory, Attack Multiplier and Defense Multiplier counts as one upgrade. The total number of upgrades across all rows you own (per shard?) sets your idle time. With one each of the four upgrades, a brand new row has an upgrade value of 4 and will become vulnerable to deletion after 4 days without logging in.
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Idle Time
Your account is considered idle when you don't login to the game. Logging in to your Google account for other activities (e.g. GMail) does not reset your idle timer. Nor does logging in to read the mySQLgame group discussion or this wiki.
