It would take 49 days if you were flowering a Mature plant.
But when you try to flower a seedling that is not showing signs of maturity then you have to add on 2-3 weeks to the flower time.
See the plant has to have the correct hormone levels to flower properly and vigorously. The plant has to be Sexually mature.
When a plant reaches maturity it will tell you by doing 2 things, First it will show preflowers at the node. Second, it will start to grow with alternating nodes.
If you try to flower before maturity your flowering will always take longer and it will not flower to its full potential. The plant will have to struggle to keep up its flower hormone levels.
I am strongly against flowering premature plants.
The most common method is to force flower a labeled clone to determine the sex, rather than the incorrect method of forcing the seedling and then reverting it to vegetative growth again.
If you are a seedling grower who does not clone, or a grower who has no seperate vegetative and flowering grow spaces, the easiest method is simply to wait for the preflowers (primordia), and sexual maturity to appear while the seedling is still in vegetative growth. In other words, if you wait until they are 6 to 8 weeks old, most plants will show you their gender without any forcing.
Seedling growers who don't clone are really missing out on the full potency potential of their finished crop whenever they force their seedlings before they've become sexually mature.
LUDA.