Dear experts,
I have some fundamental questions regarding GMAT preparation. Please chip in your views

So here we go :
1. Official Vs Non-official resources : At what stage should I start solving official (OG) questions ? Towards the beginning of my preparation or towards the end ? Moreover, should I time my study sessions when I attempt questions from OG ? i.e, should I use OG questions for timed practice or for understanding and analyzing concepts ?
2. Timing : How should I time my study sessions ? I.e what is the ideal time per question for SC,CR,RC,DS,& PS ?
3. LSAT questions : Once I complete questions from OG & Gprep, do you recommend that I solve questions from LSAT papers for improving my performance ?
4. RC : What should I read outside GMAT resources to improve my RC ? Moreover, how should I read it ? Rcs have been my Achilles heal for long , I guess this weakness is because I was never a veracious reader (Most non-natives are not , and definitely not me !)Do you suggest that I read excerpts of a passage and then read the whole passage to analyze it correctly ? Reading in real life is quite different from reading on the GMAT I guess ? So any special method you recommend that I use to read "non GMAT" content for improving RCs ?
5. Duration : Typically how many hours do you recommend for a complete and a thorough preparation ?
Thank you in advance and wish you all a happy new year