During Wireless LAN Professional Conference 2019 (WLPC_EU) in Prague, I had a presentation where the WiFi AirTime Calculator was presented. You can read about it and download it from here. And I used the results from the calculator to look at data rate versus throughput in a WiFi network.

Note
This is a theoretical approach and we assume it is no other traffic in the BSS or on the channel. And it is on a 20 MHz channel at the 5 GHz.
A Data field size of 300 bytes is used in this article. I call it the Data field size, other common names are payloads, MPDU, A-MPDU or frame body. The Data field is the correct name according to the standard and it embraces all frame format types.

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I have made a YouTube video on how to capture 802.11ax OFDMA traffic with Jetson Nano. It is pretty much the same as in this article and this article