Recommended number of bench spots

Starting a new Dynasty league this year and was wondering what people thought was the best bench size.

We have selected 16 but are thinking of increasing to promote trading. Interested in what people usually do?

I think most dynasty leagues average between 22-32 total spots. If you want to promote trades, thus less waiver action, increase that number to 25-32.

Kind of a dumb thing to ask, but do you have d/st or k in the league? If yes, definitely go 27+

Thanks! Yeah we have included d/st and k so should be going for larger bench then.