And that day came at Oamaru on Saturday, when the beautifully bred daughter of Sundon and former Rowe Cup winner Inspire cleared away from her maiden trotting rivals to win by three lengths.
Her time of 3.23.1 was 0.1 seconds inside the previous track record for a 3yr-old filly in a 2600m trot set by Alexandra Leaving in July 2013.
Despite the fact she was a maiden filly until Saturday, her trainer, Paul Nairn, had set her a few substantial assignments this year.
She finished fourth in the Trotting Oaks and seventh in the New Zealand Derby.
"She went nice and they went a good time today. She's probably improved a bit and hopefully, she keeps improving a bit.''
Sunny Afternoon will race at Addington next week before having a crack at the $80,000 sales series 3yr-old trot at Addington on May 21, and the Harness Jewels at Cambridge a fortnight later.
Nairn added a second win later in the day with Quevert, who was reined home by junior driver Matt Anderson.
Further records were set. Donegal Rundlescreek made the trip south from Kaikoura very worthwhile for part-owners Hoppy and Anne Rundle.
The Bettor's Delight filly paced the 2000m from the mobile in 2.25.87, 1.1sec inside Speight's Girl's time of 2.26.9 in 2014.
The Rundles, who share in the ownership with Murray Boyd, also of Kaikoura, also had success in the late 1980s with That's That (9 wins), who was second to Race Ruler in the 1986 Sapling Stakes and the New Zealand 2yr-old championship.
A third track record fell on a perfect warm and still autumn day in Oamaru in race 9 when Ultimate Desire smashed the 1999 record for 3yr-old fillies in a 2200m mobile pace.
The Brad Mowbray-trained filly paced the trip in 3.13.87, clipping 2.2sec off the record set by Gee Cam in May 1999.
The record-setting was not over, though.
Torrid Bromac saved the best for the last race, when he dashed along to set a new time of 3.11.7 for 3yr-old colts and geldings in 2600m mobile paces at Oamaru, 5.5sec inside the previous record set by Franco Nicholas in 2003.
Torrid Bromac's owners, Mary and Max Taylor arrived at the racecourse by helicopter, courtesy of their son, John, but during the running, it appeared a helicopter might be the only way Torrid Bromac would get clear after being stuck three-back on the markers.
However, driver Craig Thornley did not panic, eventually angling out the colt to finish stylishly down the middle of the track.
● Boomer Bailey can be a big chance in his races providing he steps away, and he managed that in the c3 and faster handicap pace on Saturday.
Driver Matthew Williamson sent the 5yr-old to the lead and he was never headed, earning his seventh career win and his fourth this season.
His trainer, Graeme Telfer, said age had been Boomer Bailey's best friend this season.
"He wants to try hard and he's hardly ever gone a bad race in 50 races or more, but you've got to get the breaks. And he wants to go all the time, and can go,'' he said.
"He's a good straight pacer. He crossfires a wee bit but doesn't knock any knees like a lot of Live Or Dies. He's a good old hard bugger.''
