Hi Derek,
Welcome!
When Logelloop is registered you can put very long loop length. Logelloop recommends 77s, but I think you can choose for more…
Probably 180s or more with 512 ram. The more RAM you have, the longer will be your loops.
If you choose a too long length, Your mac will swap from the Ram to the HD and some audio artifacts will occurs…
If you need a more precise answer, I can make some test with my Mac and tell you.
The External sync already exists, but is not ok for every cases.
For example, Ableton Live has some difficulties to sync Logelloop in realtime.
Best regards,
Philippe