ann,
I used the rodinal 1:10 (1 oz rodinal + 10oz water) in 8x10 trays to develop 4x5 paper from 4x5 contact prints and it worked fine. Of course you can make much bigger quantities (1L Rodinal + 10L water if you wish)
my printing session lasted an hour and i did 15 prints and they were great.

the volume would probably go down if you use fibre paper.