Kajal spoke on the phone from 4{:}50 \text { p. m.}4:50 p. m.4, colon, 50, start text, space, p, point, m, point, end text until 6{:}19 \text { p. m.}6:19 p. m.6, colon, 19, start text, space, p, point, m, point, end text How long did Kajal speak on the phone?