TORONTO — Let’s throw it out there to get the conversation going:

What would you set as the Over-Under line for “Number of 2019 postseason games in which the Yankees’ starting pitcher lasts at least five innings”?

I’m going with two. And I’d recommend the Under.

The latest piece of evidence arrived Thursday night at Rogers Centre, in the form of Domingo German. Oh, sure, the Yankees won again, their offense continuing to steamroll inferior opposition, this time to the tune of a 12-6 victory over the Blue Jays that extended their winning streak to nine straight games and increased their advantage in the American League East over the Rays to 10½ games.

Gio Urshela, whom the Yankees purchased from the Blue Jays on Aug. 4, 2018, went deep twice and drove in four runs, giving him four homers and eight RBIs in two days, and wunderkind Mike Tauchman added a homer and four RBIs of his own.

You’re kind of punch-drunk by the nightly beatdown tallies, though, aren’t you? You’re thinking ahead to October, and you’re wondering exactly how the Yankees will get by the Astros.

The closer we get to the postseason, the more the answer appears to be: With a little help — OK, make that a lot of help — from their bullpen friends.

Because if German, the Yankees’ best starting pitcher this season, struggles to get through a third turn in the lineup come October, as he did with the Blue Jays on Thursday night — and he has for the bulk of the season — then Aaron Boone had sure as heck better not keep him out there the way he understandably did in this regular-season game, with plenty of cushion in the division and a need to rest relievers … to prepare them for this very scenario in two months.

German did make it five innings, the minimum threshold to qualify for his 15th win, which tied Justin Verlander for the major league lead, whatever that means (virtually nothing). To get there, German saw his ERA rise from 3.98 to 4.05 thanks to a four-run, nine-batter bottom of the fifth in which the right-hander surrendered two homers, a double, two singles and was victimized by a Cameron Maybin error before retiring Randal Grichuk on a grounder to Urshela for his 15th and final out of the night.

“Tonight the sharpness of my pitches weren’t where I would want them,” German said through an interpreter. “But I still was able to battle through those innings, and then I got to that fifth inning, and they were able to take advantage of some of those pitches.”

Here’s German’s breakdown of his turns through the lineup, courtesy of Baseball-Reference.com, with updates from Thursday:

First time: .198/.240/.352

Second time: .237/.294/.442

Third time: .296/.337/.592

Asked about the challenges of that third trip, German said: “There’s a plan of attack. It doesn’t matter how many times you go through the lineup. They are making adjustments throughout the game, and I’ve got to make adjustments throughout the game. That’s what it’s all about.”

That’s what you want your pitcher to say, yet at the first sign of trouble in the playoffs — even with, say, the 8-2 lead German held when it became quite evident he was running out of gas — you have to wish him well and go to a fresh arm. Given that no Yankees starting pitcher has consistently pitched deep into contests, this probably will be standard operating procedure in the postseason, measured against the hope that the savage offense will provide so much breathing room, the elite relievers won’t be needed every single game.

With an unidentified innings limit — The Post’s Joel Sherman has thrown out the reasonable guess of 150 — and 109 innings already on his odometer, German won’t be replicating 1956 Don Larsen no matter how he pitches. If he even starts playoff games, German should be utilized as a twice-through-the-order guy.

Which would give you all the more reason to bet the Under.