it is proper with that wording to use "much." if the sentance was: how many minutes do you need to finish your work? than you would obviously use "many."
Many.....
How much grammar use.
There are many rose bushes in his garden.
Which government? There are many.
trent that's how much
Many applications use magnesium to alloy with aluminum to make that much stronger.
That depends on how much less paper you use...
Pretty much everyone in the world use drugs.
In my opinion, 'many' sounds better.But technically, they are used for different purposes.If a noun is in singular, we use muchExample: much moneyIf a noun is in plural, we use manyExample: many friends
measure, add, subtract, multiply, find area, figure how many boards to buy, how much roofing to use, how much insulation to use.
how many, because you can count it. If you can't count something like sugar, use how much