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Application Pool Recycle times

  Microsoft IIS Server has the application pool recycle time default to 1740 minutes, which is exactly 29 hours.

For a situation where you don’t know the environment, 29 hours is probably a good default starting point. However, as an archer administrator you will likely be familiar with your environment, and it may be best to change this after days or weeks of monitoring and analyzing your site traffic. It is recommended to set this to a fixed time (like 4:00 AM ET/1:00 AM PT in the US).  Setting it to a fixed time each day during low traffic times will minimize the impact and also allow you to troubleshoot easier if you run into any issues. If you have multiple application pools, it might be wise to stagger them to avoid overloading the server with recycles.

Note that IIS overlaps the app pool when recycling so there usually isn’t any true downtime during a recycle. Existing actions will continue to process until complete and any new actions will be picked up by the newly spawned worker process. However, in-memory information (session state, etc) would be lost.
In theory you don’t really need a daily recycle unless you have a known problem. A daily recycle is just a preventative measure to refresh IIS in case there is a slight memory leak or anything else that may slowly creep into the worker processes. Keep in mind that you can turn it off completely however, it is a recommend setting it to recycle once per day at an off-peak time as a proactive measure.

  
Idle Time-out

While on the topic of app pool defaults, there is one more that you should consider changing with every new server deployment. 
The Idle Time-out should be set to 0 unless you are doing bulk hosting where you want to keep the memory footprint per site as low as possible. 
 

If you have a just a few sites on your server and you want them to always load fast, then set this value to zero. Otherwise, when you have 20 minutes without any traffic (unlikely in a busy Archer environment, but still plausible) then the app pool will terminate so that it can start up again on the next visit. The problem (albeit minor) is that with the first visit to the site, an app pool needs to spin up a new w3wp.exe worker process which can be slow because the app pool needs to be created, ASP.NET or another framework needs to be loaded, and then your application needs to be loaded. That can take a few seconds. Therefore, from experience, it is recommended to set that to 0 when possible, unless it’s for a server that hosts a lot of sites that don’t always need to be immediately available.