Tickets for Garth Brooks' comeback tour went on sale Friday morning (July 25). As expected, what started as an onsale date for just one show -- the first stop on his worldwide tour on Sept. 4 in Chicago -- quickly turned into a ticket frenzy for 10 concerts. An estimated 180,000 tickets were sold in less than three hours.

The last time Brooks played Chicago, in 1997, he sold 139,000 tickets in less than four hours for his eight shows.

Here's the timeline for Friday's ticket announcements:

At about 9:15 a.m., just 45 minutes before the Sept. 4 show tickets were set to go on sale, the concert promoter issued a press release citing "immense uncommon interest in this event" and announced the addition of shows on Sept. 5 and 6 at 6 p.m. and Sept. 11 at 7:30 p.m. Those additional three dates went on sale at 10 a.m.

At 10:35 a.m., another show was added (Sept. 12 at 6 p.m.).

At 11 a.m., another show was added (Sept. 13 at 6 p.m.).

At 11:30 a.m., another late-night show was added (Sept. 6 at 10:30 p.m.).

At 11:48 a.m., another late-night show was added (Sept. 12 at 10:30 p.m.)

At 12:40 p.m., another two shows were added (Sept. 13 at 10:30 p.m. and Sept. 14 at 7:30 p.m.)

By Friday afternoon, the official tour count was at 10 shows in Chicago at the Allstate Arena, a venue that will have a seating capacity for this tour of approximately 18,000 at each show.

The Ticketmaster website had some technical issues during the 10:00 hour, but Brooks and his wife (and the show's opening act) Trisha Yearwood took to her Twitter account during the sale to encourage fans to keep trying.

Earlier in the morning, Brooks called Chicago's country radio station WUSN and talked with morning-show team Lisa and Ray about what it was that brought him out of retirement and back to Chicago after 17 years.

"The faces," Brooks said. "I miss them, I miss looking out and seeing them singing. You look out there, and you hope to see the faces you remember. And I gotta tell you, I've seen those, but the other half are faces I've never seen, and they're kids. And kids that know all the words to every song."