'Attack on Titan' has the largest online community out of the list of options that I provided to you. It has several large online forums and communities dedicated to it, such as the Reddit subreddit, r/ShingekiNoKyojin, which has 1.4 million members, and a dedicated Discord guild.

There are over eighty episodes of 'Attack on Titan', and the series is continuing, with the latest release, as far as my knowledge goes, being on March 4th, 2023, with Episode #88 'THE FINAL CHAPTERS Special 1'.

Each episode is around 30 minutes, which should meet your requirements for length. You should be able to catch up to the latest episode relatively quickly with the large wealth of knowledge available on the series.

'Attack on Titan' has a very large community that holds a vast amount of knowledge surrounding the series. It would be an excellent choice if you're looking into joining an anime or manga community, without needing to understand a large quantity of episodes.

Let me know if you have any questions about 'Attack on Titan' or its associated communities!
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