ISIS Hello Interval

Dear Experts,

What is the unit of Hello-interval value shown under the interface?
Seconds or a Numeric factor..

While I am doing IEM vol-1 I found that to configure 19 sec as
hello-interval Solution Guide presents the config as "isis hello-interval
58"

In INE I am seeing that as just taken as seconds (vol2 - lab 4) . When
question asks to configure 5 sec hello-interval, SG presents as "isis
 hello-interval 5".

Command reference says its seconds:
 Setting the Advertised Hello Interval

You can specify the length of time (in seconds) between hello packets that
the Cisco IOS software sends on the interface.

To specify the length of time between hello packets for the specified
interface, use the following command in interface configuration mode:

   Command
 Purpose

Router(config-if)# *isis hello-interval* {seconds | *minimal*}* *[*level-1*|
* level-2*]

Specifies the length of time (in seconds) between hello packets the Cisco
IOS software sends on the specified interface.

http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfisis.html#wp1001038

Which one is right?

-- 
*Regards,*
*John*
Blogs and organic groups at http://www.ccie.net