# O2 Duration — user reviews

> 2 indexed App Store user reviews of O2 Duration by Advanced Aviation LLC, rated 1.00/5 from 1 ratings.

- Source: https://appshunter.io/ios/app/o2-duration/id556420187/reviews
- App overview in markdown: https://appshunter.io/ios/app/o2-duration/id556420187.md
- Rating breakdown: 5★ 0 · 4★ 0 · 3★ 0 · 2★ 0 · 1★ 1

## Most critical reviews (2 lowest-rated)

### 1/5 — Dan

*2020-03-05, version 2.0*

Math is wrong
Does not work and no refund
I would have thought Apple would have vetted this product 
Do no buy!

### 1/5 — Help

*2015-05-27*

My husband uses an m-248L (the old C class) There is no distinction between the tank sizes for the M class tanks that I can find on the app and there doesn't seem to be a corresponding tank size to pick. I am looking forward to using this app it seems very easy once I can get the correct tank size

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*