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For analog design you dont usually use the minimum allowable Length. You usually keep it somewhere between 2x Lmin or 3 Lmin. You may ofcourse vary it later during the design phase for tweaking your values when everything else is more or less finalized
It is all depend on the need of your circuit design and functionality. If your circuit is to operate in the wideband frequency, then the minimum L will be used, on the other hand, if it were to used for biasing circuits, or low frequency application, you can set your value to 2X and above as what others responded.
you need to check manuals provided by foundry.
these manuals specifies what are allowed lmin/lmax wmin/wmax for process.
as your models are extracted for these limits , if you give some dimension outside these limits .. your simulator will error out.
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