I don't think you can do that. Lambda has a max limit of 5 minutes per invocation. You can however schedule Lambda to invoke as per schedule just like cron.
You'd probably be better off having a small EC2 box that runs long processes than AWS Lambda if your processes can't be broken into 5 minute chunks.
You'd probably be better off having a small EC2 box that runs long processes than AWS Lambda if your processes can't be broken into 5 minute chunks.