Hi @praveen D & @Anonymous ,
You get 750 hours free usage of a B1S VM SKU per month.
Please take a look on this screenshot (Source: https://azure.microsoft.com/en-us/pricing/free-services/)
Virtual Machines = plural ... Which means 1 or more VMs. Per month you get 750 hours for B1s:
1x B1S running 24/7 (744 hours in a month with 31 days) - 6 hours"unused"
or
2x B1S running 375 hours per month = 750 hours per month in total.
and so on
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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)
Regards
Andreas Baumgarten