Why GitHub Actions Scheduled Workflows Don’t Run on Time

GitHub Actions scheduled workflows (using schedule with cron syntax) often run significantly later than the specified time, and sometimes not at all, because GitHub does not guarantee exact execution times for scheduled events—they are queued and run “as soon as possible” within a broader load-balancing window. This article explains the technical reasons behind the delays, how the scheduling system actually works, and what you can do to make your workflows more reliable.

Formula

The calculator above computes your average pace (time per kilometer) and speed (kilometers per hour) when you enter a finish time and distance. The formulas are:

Pace (min/km) = Finish time (minutes) ÷ Distance (km)

Speed (km/h) = Distance (km) ÷ (Finish time (minutes) ÷ 60)

Variables:

• t – finish time in minutes (e.g., 50 minutes)
• d – distance in kilometers (e.g., 10 km)

The pace tells you how many minutes each kilometer took; the speed tells you how many kilometers you covered in one hour.

Worked Example

Using the default values from the calculator: finish time = 50 minutes, distance = 10 km.

Step 1: Calculate pace: 50 ÷ 10 = 5.00 min/km.

Step 2: Calculate speed: 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.00 km/h.

The calculator displays: Pace = 5.00 min/km, Speed = 12.00 km/h.

When to Use This Calculator

Use this tool to plan your training pace for a race or to evaluate a recent run. For example, if you want to finish a 5K in 30 minutes, enter 30 minutes and 5 km to see that you need a 6:00 min/km pace. This is also useful for setting treadmill speeds or comparing your performance across different distances.

How to Read the Result

The pace result is the most intuitive for runners: a lower pace number means faster running (e.g., 4:30 min/km is faster than 6:00 min/km). The speed result is helpful if you are used to kilometers per hour, as on a treadmill. Both numbers are rounded to two decimals for readability.

Common Mistakes

• Mixing units: If you enter distance in miles, the pace will be in minutes per mile, not per kilometer. Convert miles to kilometers (1 mile = 1.60934 km) before entering.
• Forgetting to convert hours to minutes: If you have a finish time like 1:30:00, enter it as 90 minutes, not 1.5 hours—the calculator expects minutes.
• Rounding too early: If you round the pace to the nearest minute, you lose precision. Keep at least two decimals for accurate speed conversion.

Limits of the Formula

This formula assumes a constant pace throughout the entire distance. In reality, most runners slow down or speed up due to terrain, fatigue, or race strategy. The result is an average, not a split-by-split prediction. Also, the formula does not account for elevation gain, weather, or stop time (e.g., at water stations). For hilly courses, your actual pace will vary, and the average may not reflect the effort required.

Frequently Asked Questions

How do I convert my pace to miles per hour?

Divide 60 by your pace in minutes per mile. For example, a 10 min/mile pace is 60 ÷ 10 = 6 mph. If you have a pace in min/km, first convert to min/mile (multiply by 1.60934) then use the same formula.

What is a good running pace for a beginner?

A comfortable conversational pace for a beginner is typically between 7:00 and 9:00 min/km (11:15 to 14:30 min/mile). This varies by age, fitness, and experience. The calculator can help you find your current average pace from a recent run.

Why does the speed result look different from my treadmill’s display?

Treadmills often show speed in km/h or mph, and they may be slightly miscalibrated. Also, the treadmill’s pace is based on belt speed, not your actual ground speed if you run with a slight incline or off-center. Use the calculator with your treadmill’s time and distance to see what speed it corresponds to.

Can I use this for walking?

Yes, the formula works for any activity where you cover distance over time. A typical walking pace is 12–20 min/km (about 3–5 km/h). Enter your walking time and distance to get your average pace.

How do I calculate pace for a half marathon?

Enter the distance as 21.0975 km (the official half marathon distance) and your target finish time in minutes. For example, a 2-hour half marathon is 120 minutes, so you would enter 120 and 21.0975 to get a pace of 5:41 min/km.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2