When you make a lesson every day on Duolingo, you have a streak of x days.
Which word/expression one would preferably use for that in Esperanto? Which other meanings would it also have?
I have been saying sinsekvo. I never gave it much thought.
Checking PIV, I'm confident that sinsekvo is OK. Of the other suggestions so far, serio also seems good after checking PIV.
I would probably use serio da tagoj or just serio for short. Maybe even tagserio? (Please correct me if this is wrong.)
A streak is a stripe, so you could say strio or tagstrio. Five-day streak: kvintaga strio.
Serio is also correct of course, but strio seems more vivid.