The pause between u and uw here is very short indeed. When I say it myself I also pronounce it continuously, but for myself there is a bit of a difference in tone between u and uw (for uw my voice is a bit deeper). Though I am not sure if that difference would be very noticeable as I only notice it if I pay very close attention.
Why in the Dutch formal form one uses: "heeft u" = 3 person of the verb to have + u , while with the verb to be, few sentences earlier, I found "bent u" = which is the 2nd person of the verb? According to one of El2Thek's answers below (In combination with u, heeft and hebt are correct) I understood that one can use "heeft/hebt"... hence, then we can also use "is/bent" like: is u... or bent u...? Dank u wel in advance.