Answer:
Must wait for 20 years
Step-by-step explanation:
Exclusive rights granted for an invention is patent. The law protects the invention from commercial exploitation by others apart from the inventor. The protection is time-limited.
Patents last for 20 years. Before the expiry of the 20 years, any attempts to produce goods under patent protection is illegal. A person wishing to manufacture and sell goods under patent must wait for its expiry.