Episodic Memory Decoding I'm planning a study on memorability of episodic events.
Therefore, participants record a couple of hours of their daily life using an egocentric camera (encoding).
After a certain time, they are shown snippets from the recording and judge whether they remember it or not (decoding).

I don't have a psychological background, hence I have some questions:


How long should the snippets be? Currently, we have 5sec videos, separated by 10sec margin.
I know chunking, however, it happens in encoding phase, I'm looking for an equivalent in decoding.
Maybe showing a few frames from the video is better than playing video?
How long should the time between encoding and decoding be? Currently, it's 6 to 8 days. I'm aware of Time Scale Similarity.
I've found a work that suggests that asking people whether they remember or not is sensible. However, any further evidence would be great.
I think Experiences of Remembering, Knowing, and Guessing is also highly related.


As this is a scientific work, references are highly appreciated.
The answers to your questions in your post would depend on the scope of your study.  For example, with


  How long should the time between encoding and decoding be?


it would depend on what criteria is set within the scope of the study.  If the people who are asking you to perform the study are asking for specific timescales then you need to stick to them and outline that in your report.

If however you have freedom to do so, as you seem to be asking on a psychological standpoint, it may be beneficial to test different timescales and maybe tabulate the results of memorability against time. You could even test different timescales against different ranges of emotional levels attached to the event.

For example, 

does a person remember a highly emotional episodic memory longer than a non-emotional one? 

What about medium levels of emotions?

You could also add to this with your question on how long snippets should be.

Does a 5sec video snippet help someone to remember better than a single frame image?

If you have the time and freedom to explore, you can conduct a large amount of research on memory.  It would only be down to how wide you can make the scope of the study whilst keeping it within the remit of what you are trying to find out.