Suggest go up Ptermigan route and then down main route south from summit as easier this way round in that less steep descent so less chance of trips
I ran so time taken reflects this
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Warning Please note that hillwalking when there is snow lying requires an ice-axe, crampons and the knowledge, experience and skill to use them correctly. Summer routes may not be viable or appropriate in winter. See winter information on our skills and safety pages for more information.