First of all, everyone aims for 65+ or 79+ or 90 to get 10 or 20 or 30 points respectively while applying PR.
Nevertheless, if you want to score 65+ in all sections, a minimum of 3 weeks’ extensive practice with the right techniques is mandatory (Assuming 2 hours/day). A complete month or 5 weeks of hard work with the right approach is advisable if one aims for 79+. Finally, If you are looking for 90 in all, You need to give 4 hours each for complete 2 months.
I would also suggest my friends to not to practice blindly that does not help them crack PTE. Practicing with the right tips and tricks and use right mock tests platform from necessary to score above 65 and 79.