Your filing requirement is based on the amount of income earned while physically in CA and your total gross income (worldwide).
The reason you were in CA and the number of days are not relevant. No matter how many days you spent in CA, you are still a non-resident but you will need the # of days to calculate your CA-sourced income.
The following webpage should answer your question - Part-year resident and nonresident. See the "Do I need to file" and the "Filing Requirements" sections.
For example, if you are under 65 with "0" dependents, you are required to file a non-resident CA tax return if your Total gross income (worldwide) was $18,496 OR your CA adjusted gross income was $14,797.
