How can i straighten my hair faster?

i have really thick curly, frizzy hair and after i have blow dryed it, it grows even thicker…so i was wondering if anyone has any tips on how to straighten it in aq quicker time…usually it takes 1.5 hours and my arms are aching by the end..i do it in sections to make sure i get the roots because they are the worse parts. please help me…any suggestions..:)

thank you x