efabless gives 10 mm^2 of project space and the 130nm process node allows for 170kgates to 210kgates per mm^2. That translates to 1.7M-2.1M gates per chip.

Sources:

1. https://efabless.com/

2. https://docs.google.com/document/d/1sMmoCfS5l6Uz8sl9Bk3R32Xt...