I noticed that TurboTax has default durations for different types of assets, for example, 5 years for computer equipment.
Those defaults are specified by the IRS in IRS publication 946 - How to Depreciate Property. For many asset types, you can use an alternative depreciation method. Appendix B is the table of class lives and recovery periods.
The first two items refer to office furniture and computer equipment respectively. For depreciation, by default the TTX program will use GDS (MACRS). But if you want to use ADS the program can most certainly accommodate that.
