The Chicago Online Demotic Dictionary

Demotic is a very cursive script and reflects extensive differences in handwriting; these differences, in turn, reflect different types of texts (private letters, economic and legal documents, administrative documents, religious, literary and scientific texts, etc.), different proveniences of texts (especially noticeable are differences between texts from the Fayum and area around Cairo and those from the Thebaid), and different dates of texts (Demotic was used for a thousand years from the 7th century B.C. until the 3rd century of our era [occasional graffiti occur even later]).

Via: Oriental Institute | The Chicago Demotic Dictionary.