In order to avoid this 24hours termination, you an set up a Google Cloud Scheduler and integrating with Google Cloud Function intelligence and pub-sub for automation and alert, so it can create an on demand instance.
Spot Instance: This is based on bidding. Spot instances go above 24hours before termination. Spot instances has all the advantages of preemptable VMs and no limitation of operation.
Committed Used Discount: This is one of the advantage to provision your resources based on discount. When it comes to time frame you literally need a particular resource for a period of time, based on this, you can enjoy up to 70% discount for cost saving.
There are two types of committed used discount:
a. Resources based CUDs: This is the amount compute optimize workload which you're getting into commitment for a particular period of time. You need to make sure you're consistent, and you pay a fine if you default the resources you signed-up for. Google cloud grant A year and 3 years within this discount.
b. Spent based CUDs: This is the amount of money you're willing to spend per hour for a particular resources for a specific duration of time. For example, You can set up a figure( budget) and google cloud can provide you what is within that range of services and a discount will be granted by google cloud. And if you're not consistent within this region budget, you'll pay a fine.
Sustained Used Discount: By default you can leverage on this pricing model. So, whenever you use applicable resource for more than fourth of a billing month you automatically receive discount for every incremental hour when you continually use the resource.
Referencing: Google Documentation
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