well this is to the best of my knowledge-
1. 2 days of break allowed after completion of first 500km, exclusing the day of arrival and departure...so if you arrive mgs on 10th,you can book for mgs to ndls on 13th
2.you will get telescopic but have to get it endorsed by station master mgs or else the onward journey will be invalid...though endorsement rule is recently lifted up in pre planned tickets,but still get it endorsed for ur safety...