Search for a thread “First Impressions”. There you can find a review of pre-production models (rather: prototypes) and a statement that after a day of heavy use there was still plenty of charge left.
For concrete numbers we’ll have to wait until the actual devices are out but it looks like with a bit of sensible connection toggling you can get a week on a full charge.
[edit] Here it is: First Impressions of the new Jolla Phone
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