I have too many hobbies. This is a known problem. The first step, I decided, was to visualize the situation.
The hobby grid maps each activity on two axes: frequency (how often I do it) and depth (how much skill and knowledge is involved). The bubble size represents time investment per session.
What I discovered: my high-frequency hobbies are the low-depth ones. My deepest hobbies get the least time. This is probably not a surprise to anyone who studies human behavior, but seeing it as a scatter plot is bracing.