The phrase "the extent of how" is correct and usable in written English.
You can use it to indicate the degree or limit of something. For example, "I was surprised by the extent of how difficult the exam was."
The extent of how hard that is – for young male athletes to open up emotionally – shocked me," Donnelly says.
They are too naive and young to grasp the extent of how money, politics and policy intersect, the argument goes.
"To the extent of how the individual is used in these preseason games, there is always a regard for how many snaps," Coughlin said in a conference call.
However, the successful implementation of Mobile banking largely depends on the extent of how much customers are fully motivated to adopt it.
But it was with the White House Poetry Jam in May 2009 that I finally understood the extent of how lit this era of cultural programming at the White House would truly be.
NUJ general secretary Michelle Stanistreet said: "It says a lot about our capital's police force that they are refusing to provide basic information about the extent to their snooping and targeting of journalists, preferring to hide in bureaucratic excuses rather than cough up and reveal the extent of how they have compromised sources and press freedom.
Poverty has a lasting impact on children, and understanding the extent of poverty, and how to tackle major violation of children's rights are essential for the development of the country.
Regardless of the amount of time that needs to be devoted to teaming (which, as discussed, is a function of the extent of interdependency), how should that time best be used?
The extent of integration — how far the process has gone beyond transferring government responsibility for ECCE into education — varies considerably across the countries: it has gone furthest and deepest in Sweden and Slovenia.
However, we also found great variability in the extent of MA, how rapidly its onset occurs, its duration, and the extent of hypodiploidy generated between drugs and cell lines.
As with the millions of Facebook users whose data was improperly passed to Cambridge Analytica, the company is unlikely to be able to precisely confirm the full extent of how the search loophole was exploited to leak personal data.
