Trading sessions inside common calendar-day block windows

Answered against 22 years of US equities and 12 years of US options data and published with the query that produced it. This result is stored as of 2026-08-22, from Mutual Fund Frequent Trading Limits Explained.

Rows × columns

4 × 2

Computed

2026-08-22

Completeness

No missing values

Source

US exchange, SIP and OPRA market data

Licence

Strasmore terms · free, no signup

Formats

JSON · CSV · the SQL below

What each column holds

Computed from Strasmore's warehouse of US exchange, SIP and OPRA market data. Equity prices are delayed; options greeks and implied volatility are end-of-day. This result is stored, not recomputed on load — it is exactly the numbers that were returned on 2026-08-22, and the query below is what returned them.

SELECT
    concat(toString(w.days), ' calendar days') AS block_window,
    countDistinct(s.d)                         AS trading_sessions
FROM
(
    SELECT arrayJoin([30, 60, 90, 180]) AS days
) AS w
CROSS JOIN
(
    SELECT DISTINCT toDate(toTimeZone(window_start, 'America/New_York')) AS d
    FROM global_markets.delayed_stocks_minute_aggs
    WHERE ticker = 'SPY'
      AND window_start >= today() - 200
      AND window_start <  today() - 1
      AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
           + toMinute(toTimeZone(window_start, 'America/New_York'))) >= 570
      AND (toHour(toTimeZone(window_start, 'America/New_York')) * 60
           + toMinute(toTimeZone(window_start, 'America/New_York'))) < 960
) AS s
WHERE s.d > today() - w.days
GROUP BY w.days
ORDER BY w.days