Towards the end of the movie, Jane Eyre, she runs away from her fiancee's house after discovering he is already married. However, she returns after realising her love and inability to be without him. How long is she away from Thornfield Hall and Mr Rochester before she returns?
This timeline is what you are after:
To quote some specific dates:
Thursday, 23rd: The wedding; Bertha is revealed; Jane runs away in the night
Friday, 24th: Early in the morning, Jane boards the coach
Sunday, 26th: Jane arrives at Whitcross, spends the night in the heath
So she leaves on the 23rd July, 1829
Thursday, 3rd: Jane arrives at the Rochester arms, goes to Thornfield, returns to the inn and hears what has happened; before dark she arrives at Ferndean and reunites with Mr. Rochester.
So she returns on 3rd June, 1830
So to answer your question:
It is 316 days from the start date to the end date, end date included
Or 10 months, 12 days including the end date
I've taken these details from the book, not the movie - I am logically assuming, even if the movie isn't explicit, it is following the same timeline.