Most of my funds are tech based so I'm right in the firing line if there's a correction on the horizon. I'm not looking at cashing in my SIPP for at least another 5 years though, and that's only if they perform spectacularly well over that time, so I think 7-8 years is more realistic. My best performing fund by a country mile is Legal & General Global Technology Index Trust - up 245% since I first bought into it 6 or 7 years ago!
I do have a decent pot of cash in savings too though so if there is a crash then there's an opportunity for me to buy the dips.