yup i do have a cbr 250r but i am in a dilemma will a t350 be a better option for this ride?

Brother, don't take me wrong but your approach to the endurance ride/pan India trip isn't positive.

1. You're days away from riding and you're still in a dilemma over a proper bike. My suggestion - use "your" bike. Irrespective of the cc, one always knows his bike best!
Moreover, CBR is a superb tourer.

2. Have you gotten your ride serviced? [BTW, the intervals for a CBR 250R for regular service = 6k kms]

3. Have you sourced spares? Clutch cables, accelerator cables, levers, headlamp bulbs, torch, toolkit (spanners, allen keys, screw drivers) etc?

4. Are you prepared physically? Have you worked on your endurance for such a ride? (pan India)

If yes is your answer to most of the questions above, then you need not ask anything to anyone. You have all our wishes. Ride safe!

I was just weighing all my options. Also should i get it serviced at 6000 km interval or sooner in such a long ride?

Rule of thumb - Bring your bike in the best possible shape before a ride. Get it serviced and ride for 100-150 kms to ensure everything is proper. Yes, 6k kms is the interval for a CBR under any given condition. If you're not sure, you may change the oil @ 5k.

Keep a bottle of chain lube and use it every 500 kms and I don't think the bike would complain.

Awesome.. all the best.. By the way.. I stay in Delhi.. Let me know when you are coming over... and your plan from Delhi.. I will join you till Darjeeling if I get leaves.. might be a bit difficult as I am taking 10days off of work next month to visit Delhi.. but yeah.. when you come to Delhi.. Let me know.. we can meet up.. i will PM my Contact number