What character limits do different fields have?

Work Fields (Campaigns/Projects/Task/Proofs/Requests)

Comment - 10,000
Description - 10,000
Work Item Name - 255

Data Fields

Custom Field Name and Options - 255
Tag - 50

Template/Form Fields

Template/Form Name - 255

User Fields

First Name - 30
Last Name - 30
Phone Number - 30
Job Title - 70