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.