FYI only one week of power down (1/13) is inactive. The reason for this is to preserve consistency of RC mana status between SP and STEEM. Liquid STEEM is considered fully-charged so that when you power up you get RC mana credit immediately. SP by contrast is in a variable state of charge depending on recent usage. In order to ensure that liquid STEEM is fully charged when it powers down (and avoid double spend exploits), it has to remain inactive for a period of time prior to power down. Fixing this period at 7 days is an implementation convenience.