Inactive just means his or her entire lineup of supports will never change, which is great if he's got EX Tier servants up the wazoo like Waver and Jack and Okita and Scathach Lancer. They do have a lower chance of showing up in support menu since it tends to prioritize active players.
I personally don't start to remove inactive friends unless it's been more than two weeks. Also, higher levels tend to come back after a while, so them level 110+ guys get more leeway. Lowbies tend not to come back after an absence.
As for your last question, 5 days would depend. Is the player high level with great support servants? If he is, I'd keep 'em around. If not, you may wanna consider ditching, especially if it's a level 10 master lol.
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