Optically reconfigurable gate arrays (ORGAs) have been developed to realize a large virtual gate count by adding a holographic memory onto a programmable gate array VLSI. Up to now, we have proposed a dynamic optically reconfigurable architecture for ORGAs to increase the gate count of the VLSI part, which uses photodiodes as dynamic memory to store a configuration context and perfectly removes static configuration memory. In this architecture, suitable laser exposure time for each implementation circuit is different from each other. Nevertheless, the laser exposure time is always designed as a constant to simplify its optical reconfiguration architecture and procedure. So, the affect for retention time of implementation circuits under such the condition was concerned, however, which has never been analyzed. Therefore, this paper experimentally presents that the dynamic optically reconfigurable architecture is available under a constant laser exposure condition.