How long did it take franz peter schubert to write the unfinished symphony?

Franz Peter Schubert composed his "Unfinished Symphony," known as Symphony No. 8 in B minor, in 1822. Although it remains incomplete with only two movements, it is believed that he worked on it for several months during that year. The exact timeline of its composition is not fully documented, but it reflects Schubert's innovative style and significant musical creativity of that period.