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Marci Henderson is one of the estimated 23,000 riders whose commute will be about 20 minutes longer during Fastrack repairs.

“It's pretty upsetting. If they have to do the necessary work, then I rather do the work and make it safe rather than being stuck in the train for 2 to 3 hours, which I've experienced that before,” said Henderson.

For four nights in a row, from 10 p.m. to 5 a.m., the Metropolitan Transportation Authority is shutting down the 1 train in both directions from 34th Street to South Ferry. The 2 is closed from Penn Station to Atlantic Avenue, and the 3 is being shut down completely.

To help ease the pain, the MTA is running the 5 train local from Atlantic to Flatbush Avenue.

The 4 will make all local stops from Atlantic to New Lots Avenue.

Riders NY1 spoke with say they hope it's worth the inconvenience.

“Hopefully progress comes out of it. If not, it's a whole waste of time,” said one straphanger.

The MTA says more than 800 New York City Transit workers will use the time to complete 425 tasks: scraping and repairing 19 miles of track, fixing signals and replacing worn track plates. Some stations will be painted, power washed and have tile repaired.

The MTA says Fastrack worked well the first time it was tried: last month on the 4, 5 and 6 lines. Because workers didn't have to stop for passing trains, the agency says they were able to do two months' worth of work in just four nights and save $600,000 in the process.

“They were able to work as teams and they were happy about their accomplishment. They did a phenomenal job,” said Carmen Bianco, MTA’s senior vice president of subways.

The repair program is scheduled for the B,D, F and M lines later this month and for the A,C and E starting in March.

The MTA says on lines like these, where there is alternate service, it'll make the overnight repairs four times a year.