72 hours free transit: Copenhagen - Shanghai - Hong Kong - Shanghai - Copenhagen

Hi.

I am Danish passport holder and I will land in Shanghai the 25th and I stay there in less than 72hours and fly to Hong Kong the 28th, but I will come back to Shanghai from Hong Kong again on the 1st of May and fly back to Copenhagen the 3rd of May.

So my question is, can I use the 72 hours free transit in Shanghai twice?

Looking forward to hear from you.