I expect a founder to normally guarantee 6 months, or 12 months or 24 months of payment before hiring someone depending on the situation at time of hire. This is the only way I would hire anybody.
Frankly I find it misplaced for a hired employee to have to worry about intricate details about company's runway and other risks etc. Its not your problem. If you are expected to own that as your problem then you might as well offer to be a founder and get proper stock.