---
title: first_max_ms
framework: coreservices
role: symbol
role_heading: Instance Property
path: coreservices/mdquerybatchingparams/1413073-first_max_ms
---

# first_max_ms

The maximum number of milliseconds that can passbefore the first progress notification is sent. This value is advisory,in that the notification will be triggered at some point after first_max_ms millisecondshave passed since the query began accumulating results. This valueis used only during the initial result-gathering phase of a query.

## Declaration

```swift
var first_max_ms: Int
```