Just same as the normal Production Environment; all the multicasts are available as long as subscribing to multicast from 1 hour prior to online until online completes.
Please be noted that the Online times are depends on the each schedules.

 

Just as the same in the production environment, by joining multicast 1 hour prior to online until the end of online, all messages are retrievable.
For information on online hours, please refer to J-GATE3.0_User_Connectivity_Test_Guide.
Please note that online hours may vary depending on the schedule.