Growing phyto - When is it done?

[I'm growing my first batch of phyto and despite some early problems with my timer, it seems to be going well.

I (foolishly?) didn't invest in one of those dip sticks with the white dot that tells you how dense the phyto is.

Any tips for telling when it's done?

Any risk to letting it go too long?]
 
[Green is good, yellow is bad.

Light green is still okay, dark green is awesome.

7 days is the maximum for a culture, and I've had to split the current one earlier (as much as at 4 days) on occasion.]
 
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