Now with the last Green Line diversion for the winter underway, the full travel time data post-January shutdown is now available.
So how much did the January Green Line shutdown deliver? The MBTA promised 8.7 minutes of time saving round trip (if split evenly then 4.3 minutes per direction) for the January shutdown. The December shutdown promised 4.3 minutes of savings (~2.1 per direction), for a total savings of 13 minutes roundtrip (~6.5 minutes per direction) as of the past week, since pre-Thanksgiving 2023.
Here's the full data for the station pairs I track: (I don't track Hynes - Science Park or Gov't Ctr to Kenmore). This data has the full data up to 1am this morning, when regular Green Line service has ended until March 9th for a 3 week diversion.
Longwood Medical Area to Haymarket (Eastbound): (Data through 2024-02-20 01:00)
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Kenmore to Haymarket (Eastbound): (Data through 2024-02-20 01:00)
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Data source: