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Measuring exactly how much traffic an instance would be able to handle is unfortunately not a simple task, and we can't give great estimations of how much traffic an instance can handle because each application is different. One idea is to run a load test (ie, simulating customer traffic rapidly) on a single instance to see how it affects performance. You can always start with smaller instances and scale them up (by snapshotting the instance and creating a larger instance from the snapshot: https://lightsail.aws.amazon.com/ls/docs/en_us/articles/how-to-create-larger-instance-from-snapshot-using-console).
In terms of how many load balancers would be needed, I don't see why you would need more than one load balancer, unless you need to spread across multiple regions.
In the Metrics tab on the instance details page, you'll be able to see CPU utilization metrics. The graph has a "sustainable zone", and if the CPU frequently exceeds this limit, you may see performance degradations. You can set alarms on your instances so that you are notified if your instances are exceeding this sustainable zone. Then you can manually add more instances to the load balancer or scale up existing ones.
Lightsail unfortunately does not offer an instance auto-scaling feature. EC2 does offer auto-scaling (https://aws.amazon.com/ec2/autoscaling/), but I agree that it's a bit more difficult to configure than Lightsail.
I hope this helps. Thank you for considering Amazon Lightsail.
-Maxwell
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