The season is more than 172 days long from first scheduled reg season game through last* but 172 is the amount of games a player needs to be on the ML roster or IL to qualify for one full season of service time. That's so you can't bring a player up on Day 2 of the season and delay his potential FA season just on that. It's more like two-to-three weeks which is what the Cubs did to Kris Bryant in his rookie season, a ploy so obvious that Bryant did the MLB version of suing them over it several years later. He lost that fight via arbitration and had to play a seventh (almost) full season before hitting the market. But it's possible that his action scared some teams into at least not being so blatant about it next time. But Acuna's 16 ML days from last year DO enter into the equation a little bit as now the Mets would have to deprive him of two-plus weeks in order to keep 2025 from being a 'full' season PLUS at least 16 more to make up for the ML service time he already has under his belt, something that would push the target date to deny him a full season from mid-April-ish into probably early May. Now having said all that, I suspect this topic is almost non-existent among NYM mgmt this Spring. Acuna is a nice prospect but he's not his brother, or the equivalent of what Kris Bryant was at the same stage. Or, to get a bit more modern, he's not on the level of Bobby Witt or Jackson Holliday. Right now, if you're a NYM fan or exec, you're hoping he's good enough to become an everyday player at some point; maybe that point is this year or maybe it never happens. And if it does happen does that mean he'll never be sent down at some point? Baty & Vientos both were, and Jackson Holliday was banished to AAA for three months last year. Is Acuna even going to be a Met in six years? And if he is will the rules still be the same by then? In short, there a so many variables and 'what-ifs' that if there's a spot for him on the OD roster then you put him on it rather than worrying about what might be the case at the end of the 2030 season, especially for a team that hopes it's going places this year. And if he pulls a 'Pete Alonso' and turns out to be good enough right out of the box and nails down a spot in the field and lineup from the very beginning and going forward without interruption then that's a good thing. * more like mid-upper 180s as obviously teams have more than 10 off days/year and remember that the season length was extended by three days a few years back