ETA (U$1.99 on sale for a brief time) is a helpful app that estimates the driving time from your current location to your destination, taking local traffic tie-ups into consideration.
To get started, you type in the name or address of a destination, clicking the '+' button to add it to your list. Once that's done, your location appears on a map. If you type a fairly common name, like Olive Garden, you may see more than one location. Check the one that has the address you want.
One of the nice things about ETA is that you can get driving times to multiple locations with a glance. As traffic conditions change, those driving estimates change as well.