Sùsòng shíxiào shì fǎlǜ bǎohù quánlì de shíjiān xiànzhì.
The statute of limitations is a time limit for legal protection of rights.
Tips
usage
时效 has multiple technical meanings: in law it is the statute of limitations (时效法); in materials science it refers to age hardening of metals (时效处理). Context is key.