3-10 years.

According to the "Accounting Standards for Business Enterprises", the depreciation life of intangible assets should be calculated based on their estimated useful life and estimated net income. The depreciation life of intangible assets ranges from 3 to 10 years.

Intangible assets refer to assets owned by an enterprise that have no physical form but have a certain value, such as trademarks, patents, copyrights, software, etc. These assets usually have a longer useful life, but they need to be depreciated over a certain period of time in accounting.