iOS 13.3 Download Size
We don't have the exact download size yet, but you can expect iOS 13.3 to command a fairly large download given that it's a milestone upgrade.
You can expect the download to take five minutes or so, but the installation process could take 10 minutes or more depending on the version of iOS you're currently running.
If you're running older software like iOS 12, your iOS 13.3 download will be a lot bigger and your installation time will be longer. This is because the features and fixes from the updates you skipped are included with your upgrade.
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Once you pull the iOS 13.3 update from Apple's servers, you might notice a prompt asking you to "Install" the software right now or "Later."
While some of you will probably want to install iOS 13.3 right away, others might benefit from scheduling the installation.
If you decide to schedule the iOS 13.3 update, you can choose to install it while you're sleeping or you can have your device remind you to install it at a later date when you've got more time.
If you do decide to install the iOS 13.3 update overnight, you'll need to plug your iPhone into a power source.