This is my method, and it nearly always works. Even if I actually only do the 10 minutes, it is often the case that I discovered a blocker, and now I know that I need to find a solution for that blocker, days (or weeks) earlier than I would have if I had not used the "I'll just do it for 10 minutes" trick. This gives me more time to ask someone for help on whatever the blocker is.

When there's not a blocker, I usually end up doing way more than 10 minutes worth.