In the tight race for governor of Virginia, Election Day has morphed into Election Month.

By the time voters cast their ballots on Election Day next Tuesday, hundreds of thousands of other voters will have already done so in person and by mail during a month and a half of early voting. The state’s six-week early voting period, one of the longest in the country, began on Sept. 17 and ends on Saturday.

More than 724,965 ballots had been cast in person and by mail as of Monday, more than triple the early turnout four years ago, according to the Virginia Public Access Project, a nonpartisan group that tracks voting data.

The surge in early voting signals that the sea change in voting habits in 2020 may forever alter elections around the country.

The coronavirus pandemic has helped convert more and more voters into early voters — in the 2020 presidential election, the early vote made up 63 percent of the electorate, up from 36 percent in 2016. Even as conservatives have attacked the legitimacy of voting by mail with false claims of widespread fraud, the popularity of early voting in Virginia by both Democrats and Republicans has been shaping the dynamics of the race and may play a role in delaying the final results if the election is extraordinarily close.

Before 2020 in Virginia, early voting lasted for seven days and required an excuse from voters. Last year, the State Legislature extended early voting to up to 45 days and expanded access to all voters by removing the excuse requirement, a response, in part, to the pandemic.

“We used to shove four million voters through the doors in 13 hours,” said Christopher E. Piper, the commissioner of the Virginia Department of Elections. “Now we can do that over the course of 45 days.”

The shift in voting habits creates a host of new electoral difficulties.

With more voters casting ballots by mail, postal system delays are threatening to disenfranchise thousands of voters. With hundreds of thousands of votes cast, but no party registration data in Virginia, both candidates are pushing internal campaign projections to claim momentum.

And if the race is extremely close, final results might not be known for days, akin to the 2020 presidential election.

Virginia requires that counties begin processing ballots this week by opening the envelopes, checking for eligibility and scanning them. But the state also accepts ballots that were postmarked by Election Day but not received by officials until the following Friday (18 other states and the District of Columbia have similar provisions). In 2020, 10,901 ballots were received and counted after Election Day in Virginia.

If the race between Terry McAuliffe, the Democratic candidate, and Glenn Youngkin, the Republican candidate, is extremely close, those late-arriving ballots, coupled with an expected increase in provisional ballots, could be pivotal. A winner may not be projected for up to a week.

“I think that’s the future of everybody’s elections the more we go to voting by mail as an option for voters,” said Scott O. Konopasek, the director of elections for Fairfax County, the largest county in Virginia. “If there’s any close races, we’re not going to know until after the Friday after the election.”

While the surge in early voting has exceeded the early turnout in 2016, the numbers this year have failed to keep up with 2020, in part because the Virginia election is an off-year race. Still, based on current early voting trends, overall turnout could top out around 2.6 million, roughly on par with the 2017 elections, according to Michael McDonald, a professor of politics at the University of Florida who studies voting.

So far, early vote totals in Virginia reflect more of a shift in behavior than a rise in turnout, as 90 percent of early voters in Virginia this year also voted early in the 2020 election, according to TargetSmart, a Democratic political data firm.