Final answer:
The maximum number of Schedulable Apex jobs that can be run concurrently in Salesforce is 100. This limit includes scheduled jobs only and does not include currently executing jobs.
Step-by-step explanation:
In Salesforce, the amount of Schedulable Apex jobs that can run at any given time is limited by the platform's governor limits. Currently, the maximum number of Apex classes that can be scheduled concurrently is 100.
This limit includes scheduled jobs i.e., jobs that are scheduled to run in the future, but does not include currently executing jobs. Each unique scheduled job is associated with a single Apex class. Therefore, if you need to execute more than the allowed limit, you have to manage them carefully to avoid reaching the limit.
Learn more about Schedulable Apex jobs