Lookback range on threat intelligence in analytic rules

Hi,

I have set up a MISP-server to send Threat Intelligence into sentinel.  I have set it up via this guide (https://techcommunity.microsoft.com/t5/microsoft-sentinel-blog/integrating-open-source-threat-feeds-with-misp-and-sentinel/ba-p/1350371)
When sending the IoC's  I need to set a configuration-value for "days_to_expire". What impact does this have in Sentinel?

And another question (which might be related to the first?):
To my understanding, when making analytic rules in Sentinel, you can only lookup data from the last 14 days. If I feed 100k IoC's into sentinel today, what do i do in 14 days, when my analytic queries won't be able to query the IoC's anymore?

My wish is that I will be able to query my ingested IoC's in my analytic rules no matter when they were ingested.