Need explain full_scan_time more detailed

[skeris]

Now in readme no such explanations of what is full_scan_time, iteration_delay, full_scan_delay.

1. "full_scan_time - Time required for a full index scan (in seconds)." - is it the max time spend for full scan ? or this time must be spent to scan?
2. "iteration_delay - Max sleep time between batches (in seconds)." - why max? Can batch awake ahead of time?
3. "full_scan_delay - Sleep time between full scans (in seconds)." - full scans maddening me. how does it works?

[skeris]

Please, add more examples with comments to readme.

[Totktonada]

It seems, it is duplicate of #38. You can find there a comment, which explains how expirationd works.