Start with the Kodak Xtol time for 1+1 in rotary for Delta 100 35mm, then adjust from there?
http://www.kodak.com/global/en/profe.../j109/j109.pdf

Otherwise if you have times for 4x5 Delta 100 in rotary vs small tank, look at the % difference?

Ilford sheets also state start with up to 15% less time than small tank agitation for rotary.

Looks like it'd be 7 to 9 minutes to me at 20 celsius.

The ilford development chart doesn't specify differences for 35mm to sheet as far as I can tell.