2 - 3 hours
iPod Nano Gen 5 was not working. Suspected the battery died.
Methodically & carefully followed the guide and comments at the bottom of the guide along with suggestions in the Click-Wheel Guide.
Used a number of additional tools to expedite.
Replacement of battery and reassembly completed successfully.
See separate e-mail (to Annette Fuller at iFixit) with Step-by-Step comments. You are welcome to publish all or parts of the comments.