By Clare Berrett She has made millions singing about working 9 to 5, but Dolly Parton says that for her tobacco-farming dad, that would have been barely half a day. The 77-year-old country music legend says she gets her work ethic from Robert Lee, who rose at 4am to toil in Tennessee. She says: “I like to work, I’m just like my daddy in that respect. The work’s never too hard, never too long, if I’ve got a reason to be doing it.” It has paid off for Dolly, who has sold more than 100 million records, had 110 charting singles, 25 No1s and published more than 3,000 songs. She shows no sign of sl…