# Specs and limits

{% hint style="warning" %}
The synthetic variables engine's execution time depends on the complexity of the expression. Calculations can take a few seconds, a few minutes, or up to an hour. If your synthetic variable is tied to business-critical logic, use another approach to compute it, such as a UbiFunction.
{% endhint %}

|    Item    |                           Description                          |       Value      |
| :--------: | :------------------------------------------------------------: | :--------------: |
| Characters | Maximum characters supported in the synthetic variable editor. | 1,000 characters |


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dev.ubidots.com/synthetic-variables/specs-and-limits.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.