App allows a volunteer with unusually long service hours to be added

[Runus01]

Description: The AddressBook app allows users to add volunteers with unusually long service hours, potentially recording erroneous data.

Steps to Reproduce:

1. Open the AddressBook app.

2. Enter a command to add a volunteer with very long service hours (eg. 100 years = 876600 hours).

   Example command:

   add r/volunteer n/Joe p/98765432 e/johnd@example.com a/311, Clementi Ave 2, #02-25 t/friends t/owesMoney h/876600
   
   

Expected Result:
The app rejects the contact information as the service hours are too long.

Actual Result:
The app accepts the contact information.