I have quite a bit of experience on Breeding Tigers, that's all I do in fact.
Gestation is 5 hours.
Then 6 hours to get the Cub to 10% and able to use the feeding trough.
First Imprint will be 2 hours after this, then 8 hours for each following imprint, 7 in total including the first.
Grills seem to be best for providing heat and you will need 720 wood per Grill for the fill 0-10% phase. I usually put in 750.
For the 0-10% phase, you will also need about 750 meat per cub.
After this, like others have said, just keep the Feed though full.
Depending on where you do your Breeding, you will need a number of Grills to keep the cubs warm for the 0-10% phase , and if in the Tropics, or certain other sectors, Friges because the will overheat if too warm.
I have been breeding in O4 and only need 6 Grills, but when I was in O2, I needed upwards of 20.