In reply to Vivian.

Welcome to SAS. You ask a good question. I do not know of a way to change the default number of ticks on the continuous legend from PROC SGPLOT. I think you might have to write the underlying template and then edit it to use the VALUECOUNTHINT option in the CONTINUOUSLEGENT statement in the GTL.

I suggest you ask your question at the the SAS Graphics Support Community. In general, that is a great place to ask and learn from the experts. Example data and code will help them to quickly mock up some code that works like you want.