How can you train for tour de france?

I was thinking of aiming for tour de france.
I have no real budget.If i bought an exercise bike how long would i have to ride it each day to emulate the training.
Also would walking for 5 hours a day for 18 days with hilly terrain
emulate the workrate.
I can't even afford a racing bike!
If i got fit enough would it be possible for sponsors to finance everything if i showed adequate ability.
Thanks.

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