Laravel 3 and Laravel 4 were released in ~2012. The upgrade from Laravel 4 to 5 (released Oct 2013) is probably the biggest hurdle, but you can likely upgrade from Laravel 5 to Laravel 12 in a week or sooner with Laravel Shift.

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jt2190 6 days ago | parent [-]

> The upgrade from Laravel 4 to 5 (released Oct 2013) is probably the biggest hurdle....

Can confirm. We started on Laravel 4 and it languished at that version until someone in leadership agreed to get it updated to version 8, which seemed to mostly be about some APIs changing. (The configuration system changed quite a bit for example.) Further upgrades from 8 to 10 then 11 have been very quick. (Note that we don't use Eloquent ORM so that wasn't part of these upgrades.)

	▲	richbradshaw 6 days ago \| parent [-]
		We never did it - started but changes were too hard to manage on the large code base - we have L4 running on PHP 8.1/Mysql 8 and all is good currently!