If I read your post correctly
You are 45 and just sold your company
You own a house worth $300K which presumedly you wish to keep
You want a boat worth $250K which presumedly you may sell down the track
You have an additional "nest egg"
You do not want to work again until you "pass"
It will cost $6500 per week to live i.e. around $80K per annum including all costs for house and boat. This assumption is quite reasonable.
You need to allow 10% diminishing value for depreciation on your boat or otherwise spending the equivalent to keep it up to scratch. If you are including the boat in your nest egg then you need to factor this in.
Basically you should consult a financial planner for a proper plan.
However, as to the future cost of money
to fund $80K per annum from 45 until "passing" and if you do not work again you would need at least $2 million for your nest egg and it would have to be well invested.
Hope that helps