It's taking the city about twice as long to process mailed-in bills due to a computer glitch, the Revenue Department said Thursday.

Bills that previously took five days for the city to process are now taking up to 10, deputy revenue commissioner Marissa Waxman said. That's leading to some reports of residents with four-week-old checks that still haven't been cashed.

The trouble started the first week in February when a new software malfunctioned, requiring the city to revert partially back to an older system. The transition problems slowed things down considerably.

Waxman said residents should remain patient and disregard any late-payment fees or water shut-off notices. She expects the city to be back on track by Monday.

"While this is annoying, no one's going to lose service or money over it," Waxman said.