6 months is normal & as cells take such along time to change there is no major rush as such. The other ladies are right about that the Lletz probably got all the bad cells so next appointment will just be a repeat smear/colp to check it's all gone. If they were to re-test earlier it could alter your results as still healing. I was diagnosed with CIS in September but didn't have my trachelectomy until end of Novembet so rest assured there really is no reason for it to have to be a ASAP job. Doesn't help that time just seems to stand still for us women waiting! I'm 4 months post op & the waiting is driving me bonkers!
Hope your recovering well from your Lletz.