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The only practical limit on batch size is how long you want your batch to run. A batch can iterate over millions of records.
Would limiting the scope of the execute batch method to say 1 potentially cause reaching governor limits?
Setting a scope size of 1 will reduce your risk of governor exceptions, but increase overall run time of your job.
Does ...
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In my opinion, the better practice will be separating your Scheduler into 2 different schedulable classes.
According to the Interface segregation principle of SOLID, it's better have several specific schedulers (in your case) than one general-purpose with complex logic based on time intervals.
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This is an undocumented bug (at least as far as I can tell), but basically, it occurs in situations where the execution time is so small it causes an integer underflow, and instead returns an absurdly large value as a result. I do find it curious that you got such a "small" number, as this bug usually manifests as a duration of 2,147,483,647 milliseconds, ...
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The maximum number of SObjects a batch can process depend on the type of object returned from start.
Iterable - the maximum number is 50000 since this is the maximum number of rows that you can query from the database in a session (the iterable is an in-memory representation of the whole set of objects to be iterated)
Database.QueryLocator - the maximum ...
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