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Refer this link .. there is no absolute limit as long as you are not hitting with limits https://salesforce.stackexchange.com/questions/230615/batch-apex-chaining-limitshttps://force201.wordpress.com/2013/07/31/testing-a-database-batchable-implementation/By "stack depth" I presume you mean "chain length"; each start/execute/finish runs in its own transaction and so has its own stack. I know of no absolute limit: chaining is very kind to the platform because things run in a sequence rather than in parallel. But worth some approximate calculations to see if you will run anywhere near this limit recognizing that each start/execute/finish counts as one of these:Description The maximum number of asynchronous Apex method executions (batch Apex, future methods, Queueable Apex, and scheduled Apex) per a 24-hour period Limit250,000 or the number of user licenses in your org multiplied by 200, whichever is greater
