Quick answers at PeterWhieldon.co.uk
This depends on three main points…
The grape, the production process and most importantly, who the target consumer is.
Wines today are produced in such vast quantities with a price that indicates its consumer buying point so, relative to the grape and all its attributes, the length of time in production is cut to a required minimum to balance the quality of the wine in relation to its commercial potential.
Therefore, apart from fine wine of notable quality where we can talk years to mature the majority of wine today is ready to drink as soon as it is bottled, as all the maturation needed has been completed.