I did mine at Inverness in 5 weeks starting from Early/Mid April to mid May - but I did it intensively. I found that doing it this way ironically did help soaking it in and making sure I retained what I learned.
But doing it intensively is one thing and rushing it is another. Luckily for me, I had just finished university when I did it and didn't feel a need to 'rush'. It just so happened that I was generally quite lucky with the weather and didn't find doing 2-3 hours per day too straining