In reply to gravity:
It's a really good summit. Highest peak in the Oberland. Minimum really three days whether you come from Jungfraujoch or from the Grimsel. I prefer from J'joch. You can also add in the Grosser Fiescherhorn this way and make it four days.
Jungfraujoch > Konkordia > F'horn hut
Summit, then back to the hut
F'horn hut > Gemslucke > Oberaarjoch > Oberaarsee > Grimsel
If you are quick you can get to the Oberaarjoch hut on day two, but this doesn't really gain you much and it'll likely be very hot. Best done cold in the morning. As the others have said, relatively straightforward approach to the Huggisattel via the Fruhstuckplatz, then the final 250m or so up the ridge. I find this bit slightly easier/quicker in snowy conditions as you can stay down right of the ridge to begin with, then take to the ridge. Not much in it though.