6 months does looks like an appropriate timeframe in accordance to this part of the prospectus

"The Corporation has delivered and expects to deliver initial prototypes to customers in 2021. The samples will be used by customers to confirm that the uniquely designed optical engines meet specifications and can pass rigorous reliability testing required by the data communications industry. The Corporation expects that its devices will pass such testing and be included in the production plans of several major customers beginning in late 2021 and early 2022"