Third Learning Permit - Is Driving Test Waiting List Enough?

Yes, it is enough

How long your learner permit is valid for

A first and second learner permit are normally valid for two years. In order to get a third or subsequent learner permit you must have booked or sat and failed the driving test in the previous two years. 

If you have sat and failed a driving test in the previous two years you will be issued with a two-year learner permit.  

If you have booked or have an upcoming driving test you will be issued with a one-year learner permit. 

https://www.rsa.ie/services/learner-drivers/learner-permit/what-it-is

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