Austfred. Its only a five minute jelquing break. You can get back in the tube and gains will resume. Many of us had to take a break from the vacuum or the consequence is blisters on the glans.
Not sure that two 30 min pump sessions with a 5 min jelq between would stress the glans less than one 60 min session. My first pumping blister came about after I started pumping in the morning as well as the evening. Other more experienced pumpers might like to comment on this. Anyway the glans protector./ baby powder combo seem to be keeping the blisters at bay.