Old school growers used the amber hair method to judge when to harvest. The plant will let you know when, u just have to know what to look for. The strains will usually have a guide as to when they are ready. Most of the indicas I see are 7-9 weeks. The boys at greenhouse preach to go the extra week for maximum thc and canabanoid build up. I say use all the methods and you can not go wrong. Go to radioshack and get the mini microscope. There are sticky's on here that will show you what to look for.

it looks to me like you have at least 2 weeks to go, but theres too many variables for my guess to be worth much. Just remember, your weed will fatten up the most in the last couple weeks. When in doubt, wait it out!!!

__________________
My "Journal" When do I harvest? a no bullshit approach.

i would carry on for 1 week.
then flush for 7 to 10 days.

what strain?.

__________________
take me to your dealer.

To be completely honest, I have no idea the strain. For about a year I had kept all my seeds, from random 20 bags and eigths, and put them in a jar. Then over the summer I just tried to germinate a few random seeds from that jar and presto, this seed easily outgrew all the rest (About 5 seeds cracked but the one I used had almost an inch of growth after 4 days of germination, I was impressed to say the least.)
The first week or so of veg the plant was under a single incandescent until I realized that it was actually growing. Since then I have been using this site, got some cfls, some better soil, nutes, ect.... So I have no idea what strain it is. This whole process has been fun and a worthwhile experience, not to mention I hope to get at least a little "free" bud out of it.
The bottom leaves on the plant made me believe that it was an indica, but as the plant grew the leaves began looking more and more sativa. So with my limited knowledge I have no idea what kind of a mix it could be or if this is normal or what kind of strain it could be. The pistils turn an orange color, not purple, white, or really dark brown colors that I have seen from other plants but once again this doesn't mean anything to me other than I know its not something crazy like white widow or purple kush.

To have thicker, more indica looking leaves at the bottom?
And thinner, more sativa looking leaves on the top half?

I would say 3 weeks at the most.They should firm up and fatten up a bit more yet. Showgirl