Persisted settings are in the roadmap, I need to study how Jumble save them for Filters and replicate it.
What kind of flexibility do you need? An open field to specify the number of days? I was also thinking about an "Infinite" option, where you can simply scroll down and load more content; in this case the total count should be predefined, for example to 24h.
I also noticed some problems on loading related to profiles' loading, I need to check.
