I am sure this depends on a lot of factors:
- The size and demographics of your market
- The quality of your website
- The effectiveness of your inbound marketing
For us, it has been very effective. We have had a website for almost 10 years, but did very little with it. About 18 months ago we put a lot of effort into it. We are very busy, primarily as a result. However- I have spent 100's of hours accomplishing that.