Final answer:
The question cannot be answered accurately with the provided information; it pertains to Jane Eyre's tenure at Lowood in Charlotte Brontë's novel, which is around two years, but the references given do not contain this detail.
Step-by-step explanation:
The question about how many years Jane worked as a teacher at Lowood refers to a character from Charlotte Brontë's novel Jane Eyre. Unfortunately, none of the provided reference excerpts explicitly mention Jane Eyre or her time at Lowood. Thus, it is impossible to answer the question using the given texts. To correctly respond to the question, one would normally refer to the specific sections of Jane Eyre that cover her tenure as a teacher at Lowood, which spans approximately two years before she takes the position of governess at Thornfield Hall.