To prove to myself I can do it. I mostly want the degree, though learning more in my field comes in a close second. I mostly want to learn more in my field, though earning a degree comes in a close second. Programs vary greatly in how much time you are expected to spend on campus. Please understand that your options narrow dramatically if you only are willing to consider totally nonresident programs.
Most programs require some residency.
Indicate your preferences below. I wouldn't mind attending residency sessions for a few weeks at the beginning of each semester. I wouldn't mind attending a summer session once a year. The exact amount doesn't matter as long as most of it is off-campus. In most cases, a fully accredited doctoral degree is going to take 2-5 years with 3 years being average.