I am trying to find what if there is a limit to number of messages that can be scheduled in a queue. I need to schedule millions of messages up from 7 to 21 days in future. Looked at this but it does not say anything about scheduled messages. https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-quotas#messaging-quotas
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Service Bus queues support a maximum message size of 256 KB in the Standard tier and 1 MB in the Premium tier. There's no limit on the number of messages held in a queue but there's a cap on the total size of the messages held by a queue. This queue size is defined at creation time, with an upper limit of 5 GB.
Scheduled messages do not materialize in the queue until the defined enqueue time. For more details you could refer to Messaging quotas.