Get-Mailbox in PowerShell crashes because there's too many mailboxes - arrays

Question

I have a little problem, I want to get all the mailboxes and put them in a variable, which seems easy with
$mailboxes = Get-Mailbox
But there's too much mailboxes in our database (I think around 90k) and PowerShell crashes when I use this command. It works if I have like only 7500 mailboxes, I thought about using mailboxes paging, but how can I do something like:
$allMailBoxes = #()
$mailboxes1 = Get-Mailbox -From 0 -To 10000
$mailboxes2 = Get-Mailbox -From 100001 -To 20000
$allMailBoxes += mailboxes1 += mailboxes2
Or is there any other solution I didn't think about? I need to store this data every week. I only need the numbers, the ones with the voice enterprise option, and the average mailbox size.
Current Code :
## EXCHANGE
$allMailBoxes = Get-Mailbox -resultsize 7500
$CountMailBoxes = $allMailBoxes.count
$CountSharedMailBoxes = (Get-Mailbox -RecipientTypeDetails SharedMailbox -ResultSize:Unlimited).count
#$CountSharedMailLists = voir flo
$CountExchangeDatabases = (Get-MailboxDatabase).Count
$MailBoxesStatistics = $allMailBoxes | Get-MailboxStatistics
$tabMailBoxesSize = #()
foreach ($Mailbox in $MailBoxesStatistics)
{
$MailboxSize = $Mailbox.TotalItemSize
for($i = 0; $i -lt $MailboxSize.Length; $i++) {
if ($MailboxSize[$i] -eq "(")
{
$indexChevron = $i
## formatted quota without the bytes : "1.9 GB <2,040,110,000 bytes>" becomes "1.9 GB"
$FormattedMailboxSize = Invoke-Expression ((($MailboxSize.Substring(0, $indexChevron-1)).replace(' ', '')))
$tabMailBoxesSize += $FormattedMailboxSize
}
}
}
$tabMailBoxesSize = $tabmailboxessize | Measure-Object -Average | select Average
$CountMailBoxesAverageSize = [math]::Round($tabmailboxesSize.Average/1GB, 2).toString() + " GB"
Write-Output "Taille moyenne des BALs : $CountMailBoxesAverageSize"