How long did the Romantic period last Some say 1798-1832 and some say 1820-1910?

There is a difference between the Romantic period in literature and in music. The Romantic period in literature is usually dated earlier than that of literature. The dating of periods is frequently a contentious issue, as periods are typically labelled retroactively. Concerning music, the latter period you stated (1820-1910) is the better answer, as many Romantic composers were active during that time (e.g. Dvorak, Tchaikovsky, Rachmaninov)