Timeout while running remote script using SPE Remoting

Question

I am running the following script using SPE Remoting (trying to find all images on all sitecore sites, but this doesn't matter as it is off subject for this post):

Import-Module -Name SPE
$session = New-ScriptSession -Username admin -Password b -ConnectionUri http://sitecorehostname

$script = {Get-ChildItem -Path "master:\" -Recurse | Where-Object { $_.Extension -match "png" -or $_.Extension -match "jpg" -or $_.Extension -match "bmp"}}

$TheStuff = Invoke-RemoteScript -Session $session -ScriptBlock $script 

Write-Host $TheStuff

Stop-ScriptSession -Session $session

This gives me a timeout error:

Exception calling "ExecuteScriptBlock2" with "5" argument(s): "The operation has timed out" At \Documents\WindowsPowerShell\Modules\SPE\Invoke-RemoteScript.ps1:257 char:13 + $response = $singleConnection.Proxy.ExecuteScriptBlock2($ ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : WebException

If I run the same script in the Sitecore Powershell SPE, it runs fine and returns 4413 records.

The httpRuntime setting in my Sitecore root Web,config is:

<system.web>
        <httpRuntime maxRequestLength="512000" executionTimeout="3600" enableKernelOutputCache="false" relaxedUrlToFileSystemMapping="true" requestValidationMode="4.0" enableVersionHeader="false" />
</system.web>

So that timeout is at 60 minutes. This script times out in 102 seconds.

Is there a way to increase the timeout, or am I invoking an incorrect script?

Edit:

Here is how I implemented the code, based on the answer below:

Import-Module -Name SPE
$session = New-ScriptSession -Username admin -Password b -ConnectionUri http://sitecorehostname
$jobId = Invoke-RemoteScript -Session $session -ScriptBlock {
        # This may make the code easier to maintain.
        $extensions = @("jpg", "png", "bmp")
        #Get-ChildItem -Path "master:/media library" -Recurse | Where-Object { $_.DisplayName -eq "CoveoFacet"}
        Get-ChildItem -Path "master:\media library" -Recurse | Where-Object { $extensions -contains $_.Extension } | Select-Object -Property Name, Id, TemplateName
} -AsJob
$results = Wait-RemoteScriptSession -Session $session -Id $jobId -Delay 5 -Verbose
Stop-ScriptSession -Session $session

ForEach($result in $results)
{
    Write-Host $result.Name
    Write-Host $result.Id
    Write-Host $result.TemplateName
    Write-Host $newline
}

Answer 1

You'll want to make use of the Wait-RemoteScriptSession command. A more ideal scenario than increasing the web.config timeout is to simply poll the server for updates. Another idea after discussing could be that the timeout occurs because there is a significant amount of data serialized and returned by the service. The example filters to a few properties using Select-Object.

Import-Module -Name SPE
$session = New-ScriptSession -Username admin -Password b -ConnectionUri https://remotesitecore
$jobId = Invoke-RemoteScript -Session $session -ScriptBlock {
        # This may make the code easier to maintain.
        $extensions = @("png","jpg","bmp")
        Get-ChildItem -Path "master:\media library" -Recurse | Where-Object { $extensions -contains $_.Extension } | Select-Object -Property Name, ID, TemplateName
} -AsJob
Wait-RemoteScriptSession -Session $session -Id $jobId -Delay 5 -Verbose
Stop-ScriptSession -Session $session

Answer 2

I think that you are changing timeout wrong web.config.

Try to change it in web.config located here:

sitecore modules\PowerShell\Services\web.config