First off, the following was found on page #131 of Jorge C's bible... "Seedling and clones will need atleast 14 hours of artficial and natural light per day until plants are transplanted outdoors". That answers my question!
If anyone is interested, I received this hardening instruction and note from another forum, by asking the same question above.
1) Take cutting, prepare in hormone compound, put into rockwool, and under humidity dome. Allow cutting to root under a 24/0 light period, this should take approx. 14 to 21 days
2) Once new roots are visible, place new clones into 5 inch plastic "keg" cups. Begin hardening process by reducing light period 1 hour a day.
3) Upon reducing light to 14 hours of hid time a day (10 days after transplanting new clones), continue the hardening process by allowing the new clone to get 1 hour of natural sunlight daily (note: the first hour outdoors will be the first hour after sunrise). Continue to add an hour of outdoor time to this mentioned period, daily. Second note: In conjunction reduce the hid light time 1 hour a day, eventually the new clone will be receiving no hid time and only 14 hours of natural outdoor sun time a day, at that point, the new clone should be well "acclimated" or hardenend off for a smooth transplant. Third note: utilize superthrive for the first couple of waterings to aid in shock recovery, that may still occur during transplant. However, following the hardening schedule, should greatly reduce shock. In addition the first two waterings after transplant should not be shy (within reason), as the moister soil will allow the new roots to spread out in its permanent environment faster, and thus allowing the plant to become better anchored, for the warm months ahead.
The initial cutting to permanent outdoor transplant should be no longer than 46 days.
Light schedule: (day 1 being newly rooted clones being transplanted to 5 inch keg cups, and day 25 being transplant to ground)
Day total hours of light/ inside hid light time/ outside sunlight time
1) 24 24 0
2) 23 23 0
3) 22 22 0
4) 21 21 0
5) 20 20 0
6) 19 19 0
7) 18 18 0
8) 17 17 0
9) 16 16 0
10) 15 15 0
11) 14 14 0
12) 14 13 1
13) 14 12 2
14) 14 11 3
15) 14 10 4
16) 14 9 5
17) 14 8 6
18) 14 7 7
19) 14 6 8
20) 14 5 9
21) 14 4 10
22) 14 3 11
23) 14 2 12
24) 14 1 13
25) 14 0 14 (transplant)