Configuration, nutch-default.xml, property crawl.gen.delay with default value 604800000

[Volli <il...@web.de>]

  Hello, this is my first message to nutch mailing list. I 
hope I send it to right receiver.

In nutch-1.1 I checked nutch-default.xml for new properties. 
There I found "crawl.gen.delay" with default value "604800000".
Description says "This value, expressed in days ... Default 
value of this is 7 days."

In "Generator.java" I see the lines:

1) "public static final String GENERATOR_DELAY = 
"crawl.gen.delay";"
2) "genDelay = job.getLong(GENERATOR_DELAY, 7L) * 3600L * 
24L * 1000L;"

I couldn't find any other Scripts where "crawl.gen.delay" is 
used.

Im not really proficient in Java! So, what I read here is:

1) Define GENERATOR_DELAY as "604800000" (milliseconds? => 
if yes, this would be the "Default value of this is 7 days." 
as mentioned above)
2) Assign value of (604800000*3600*24*1000) to genDelay as 
Long. => 7464960000000000

All I want to know, because I'm really confused: Do you 
think that this is an error in nutch-default.xml or must I 
think further to understand the property correctly?

I don't understand value "7L" in 
"job.getLong(GENERATOR_DELAY, 7L)". Maybe that's the crux.

Thanks!
Volli