# Duty Cycle - Time on Air

**URL:** <https://www.thethingsnetwork.org/forum/t/duty-cycle-time-on-air/122>\
**Category:** TTN Network and Services\
**Created:** [September 24, 2015, 11:20am UTC](https://www.thethingsnetwork.org/forum/t/duty-cycle-time-on-air/122 "2015-09-24T11:20:20Z")\
**Posts on this page:** 1\
**Showing post:** 57

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [February 26, 2020, 12:39pm UTC](https://www.thethingsnetwork.org/forum/t/duty-cycle-time-on-air/122/57 "2020-02-26T12:39:25Z")

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Please stop asking the same question with different numbers. 8 nodes, 1,000 nodes, 1 hour, 6 hours, your question has been answered: you simply **must** make sure the devices do not transmit simultaneously. That’s all we can say. See also [How many gateways are needed to support 1,000 nodes sending 10 bytes per 5 minutes?](https://www.thethingsnetwork.org/forum/t/how-many-gateways-are-needed-to-support-1-000-nodes-sending-10-bytes-per-5-minutes/5527) And for those calculations too: take into account that you’re not the only one using the shared radio spectrum, now or in the future.

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