When do you call your sponsor?

Some people don't call their sponsor enough. Others call a sponsor or someone else when they could actually be developing the skill of solving problems themselves.

Here's a guideline I find helpful:

When I have a question, I examine my existing knowledge and experience and the range of materials I have available (books, documents, and other resources out there in the world) to find the answer. If these prove insufficient, I contact my sponsor presenting how far I managed to get, why this is insufficient, and what the remaining question is.