I don't do hard clues anymore but on average, an elite clue takes me about 15-20 minutes. My fastest elite clue was about 6-7 minutes but I got extremely lucky with the locations.
I use the runeapps solver for celtic knot but I do the slide puzzles on my own (love it). Usually takes 1-2 minues so it's not that bad.
Also, you shouldn't receive a scan in a location, which you have not unlocked. For example, I didn't complete Fremennik Isles quest so I didn't get Fremennik Isles scan yet. Maybe this doesn't apply to the Lumby swamp scan though.
29-Dec-2016 12:41:33