I think you can control crawlers' frequent visits through robot.txt How fast the crawling depends on how bots see your site. If you haven't make a sitemap and made your coding cleaner, the bots wouldn't crawl some of your pages. You can also control what pages you want bots can see through robot.txt Social Bookmarking sites help websites and blogs to be crawled faster because it updates it's content every minute. This way you can make your websites and blogs crawled.
Hi, I think it would all depend on your promotion jobs. Generally speaking, building backlinks from high PR (above 6) sources or putting your site links in your tweets would be really helpful for prompt indexing purpose. Have a nice day,
It depends, if you have a DoFollow backlink from a site that is heavily crawled like for example DP, then it should be less than a day usually, other with no links it could take a couple weeks