tshark rotating pcap files

Look at the tshark options for capture stop & output, similar to tcpdump, but not quite the same:

Capture stop conditions:                                                     
  -c <packet count>        stop after n packets (def: infinite)              
  -a <autostop cond.> ...  duration:NUM - stop after NUM seconds             
                           filesize:NUM - stop this file after NUM KB        
                              files:NUM - stop after NUM files               
Capture output:                                                              
  -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs 
                           filesize:NUM - switch to next file after NUM KB   
                              files:NUM - ringbuffer: replace after NUM files

You're probably looking for the -b ringbuffer option.

I am not sure I understand the question properly, but if I did:

Please always remember to use -? or --help, according to "tshark -?" output:

Capture output:
-b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs
                         filesize:NUM - switch to next file after NUM KB
                         files:NUM - ringbuffer: replace after NUM files

-b duration:600 files 7 will give you a 70 minute ring buffer (rotation). If this is not what you meant, please clarify your question.