warranty period; term of guarantee
The period during which a product is covered by a warranty or guarantee.
The warranty period for this product is one year from the date of purchase.
After the warranty period expires, repairs will be charged.
保証 is the guarantee itself, while 保証期間 specifies the time frame of that guarantee.
期間 is a general term for a period or term, while 保証期間 is specifically the warranty period.
Compound of 保証 (guarantee) and 期間 (period).