If you don't know, then you may want to back to
Depreciable Asset Category screen to choose a category and then choose a different "Asset Type" to classify your asset under, and we'll calculate the correct useful life for depreciation purposes for you.
In general, the useful life is just the number of years that the property will probably be used for.
If you're still not sure what to enter for this asset, check the
Form 4562 instructions .