# Limits, Concurrency & Cold Start (https://tenki.cloud/docs/runners/limits-and-concurrency)

> For the complete documentation index, see [llms.txt](https://tenki.cloud/llms.txt)

Concurrency defaults per plan, cold start latency, queue handling, and scale-to-zero billing for Tenki Runners.



This page is the single reference for the operational limits of Tenki Runners, concurrency, cold start, queue handling, and how idle capacity is (not) billed.

Cold start [#cold-start]

Tenki Runners cold-start in approximately **15 seconds on average**, regardless of runner size or concurrency. There is no pool warm-up step; every job boots into a fresh VM.

Concurrency defaults [#concurrency-defaults]

Default concurrent-job limits, by plan:

| Plan       | Concurrent jobs               |
| ---------- | ----------------------------- |
| Starter    | Up to 5                       |
| Team       | Up to 50                      |
| Enterprise | Custom (unlimited on request) |

Higher concurrency is available on request at additional cost. Bursting beyond your default limit causes additional jobs to queue (not fail) until capacity frees up.

Per-runner-family notes [#per-runner-family-notes]

| Runner family | Default concurrency on Team                                     |
| ------------- | --------------------------------------------------------------- |
| Linux x64     | 50                                                              |
| macOS M4 Pro  | 4 (Team default); higher macOS concurrency available on request |

Raising the macOS-specific cap is available on request; the overall account concurrency cap still applies.

Queue handling [#queue-handling]

* Jobs that exceed your concurrency limit **queue**, not fail.
* Time spent in the queue is **not billed**, billing starts when the VM is assigned and the job begins running.

Scale-to-zero billing [#scale-to-zero-billing]

Tenki bills **per consumed minute**, rounded up to the next second on the last minute. There are **no idle charges**:

* You don't pay for weekends or overnight when nothing runs.
* You don't pay for a standby pool, there isn't one.
* VMs are destroyed immediately on job completion, so there's no post-job idle time.

The only recurring charge outside per-minute usage is your plan fee (Starter $0/mo, Team $200 to $250/mo) and any active add-ons. See [Pricing](/docs/pricing) for the full breakdown.

Cache size [#cache-size]

GitHub Actions enforces a 10 GB-per-key cache size limit. Tenki does **not** apply additional storage limits or eviction policies on its side, cache entries remain available until you overwrite or delete them.

> **Need higher limits?:** If you regularly burst above 50 concurrent jobs or need a custom macOS concurrency profile, email hello@tenki.cloud and we'll provision it.