Industry standard for loading time of a website

Here I am giving some Industry standard response time. This is very useful when we don't have any data.

Response time to display web pages: 
- 3 seconds considered excellent 
- 3-5 second acceptable 
- over 5 seconds and it is not a search, considered unacceptable. 

For a search transaction, anything upto 7-8 seconds is considered acceptable. 

For web services, under 1 second is excellent. 
Upto 3 seconds may be acceptable.