# GrainDirectoryOptions.CacheTTLExtensionFactor

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.configuration.graindirectoryoptions/) | [Properties](/orleans/docs/api/csharp/microsoft.orleans.runtime/orleans.configuration.graindirectoryoptions/properties/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Runtime/Configuration/Options/GrainDirectoryOptions.cs)

```csharp
[System.Obsolete(CacheTTLExtensionFactor is deprecated and will be removed in a future version.)]
public double CacheTTLExtensionFactor
```

Gets or sets the factor by which cache entry TTLs should be extended when they are found to be stable.