This article addresses how to adjust crawl times.
Incremental crawl times can be adjusted by adjusting the Automatic Polling Interval during site registration. Full crawl times can be manually requested or will start automatically depending on the amount or type of change that has taken place.
To adjust the incremental crawl time after an initial site registration, you will need to re-register your site to have the adjustment take effect. No other steps will need to be done.
This applies to Solr Search1.0, Search2.0 (used with Ektron9.1X) and MS Search.