I did the chem unit 3 over the course of 3 weeks. of course i didnt work everyday. some days i did 2-3 hours some days nothing to 20minutes.
Really, anywork you do now will be beneficial. Even if you think you cant do it all, just do the first 1-2 chapters so that you will still be ahead of your class. then perhaps when school starts and you snap out of holiday mode you willl be keen to get ahead.
I know the feeling. i gunned it at the start of the holidays with chem and physics, and now my social life has intervened and i've been unable to start methods, so my plans have changed from doing unit 3 to simply doing the first 5 chapters which is basically yr 11 revision (functions etc.) which i will hop;efully start in the new year
The hardest part is starting. I didnt really like 1/2 physics, but i guess i never really gave it a chance and it rode backseat to my two 3/4's last year, but when i strated i got really into it and motivation wasnt a problem at all.
The same for chem. once i started i was loving doing the stoich stuff which is my fave. Some of the heavily theory based stuff eg. spectroscopy caused me to lose a bit of motivation but then i just thought that just giving it a light read over and doing a few questions certainly cant do any harm and can only help when to understand it when it arises in the classroom