Recipe & dev times for Rollei Infrared 400 in Ilford ID11 1+3

IR 729nm filter. Hand held Gossen Sixtry incident light meter set at 6asa.
Negs are perhaps ever so slightly over-developed but a full tonal range is present and images are all easily printed or scanned.
It's summer in New Zealand as I submit this. Water temp from the tap is 22 degrees hence the slightly higher processing temp. At 20 degrees celsius, I'd suggest a time of 18 minutes.