The indexing is run on the background automatically (on usb unplug/whispernet download). It's pretty quick. (around 30/45s for a 6k locations novel, maybe a bit more).
The search in itself is also pretty quick, I'd say around 1.5-4s with ~250 indexed docs. And it's displayed in a table (I'd say 8 or 10 matches per page, too lazy to check
), with an excerpt of the match shown along the title of the doc.