How many, how long to veg for and pot size

I've got a 600watt air cooled hps light.
3ftx3ftx6ft Room with mylar sheeting.
Canna coco + Canna nutes.

I plan to do 6 plants in 10 litre pots 4-5 weeks veg with LST method, but not sure. What do you recommend? I'll more than likely change my mind... lol

So here's a few questions...
How long should I veg for? (keep in mind the room space and I'm growing from clones)
What pot size?
How many plants?
If I done say, 4 plants, 6 week veg... how much more or less yield would I get from 6 plants, 4 week veg?

i think the general rule of thumb is one gallon of container for each month of plant growth..
this is just a general rule of thumb, but ime, the larger the pots and the longer the veg period, the larger your yields will also be...

i usually like to veg till i see one of two things, if not both.. the first is alternating nodes, and the second is preflowers.. both of these are indicators of the plant reaching sexual maturity and is ready to be flowered at any time..

What I would do is 2 plants,vegging for 6 weeks in 5 gallon pots. Or one whopper vegged until it takes up about 1/3, or 1/2 of your grow space if it's super trained