@Mitesh Patel Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
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I understand that your ask is about the cost calculation for real time speech to text.
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The cost for real-time transcription is calculated based on the number of hours used. In your example, you have 40 simultaneous sessions, each lasting one hour, between 3pm and 5pm. Therefore, the cost would be $40, not $2.
Please note that this is just an estimate, and the actual cost may vary depending on other factors such as the PaymentOption and Instance of the service.
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So, I would strongly encourage you to leverage the pricing calculator for Cognitive Speech Service to estimate the cost as shown below:
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Link: https://azure.microsoft.com/en-in/pricing/calculator/?service=cognitive-services
Also please go through the pricing page for speech to Text mentioned here.
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Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.
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