Based on results with Agfa Copex Rapid in Caffenol LC+C compared to previous results with both Copex Rapid and Imagelink HQ in Caffenol LC (without the ascorbic acid), I'd expect to get EI 32 to 50 with excellent tonality and resolution with Imagelink HQ in Caffenol LC+C. I'd expect to use 12 minutes, agitation every 3rd minute, as a starting point.
For reference, Caffenol LC+C is:
2 tsp (slightly rounded) Folger's Coffee Crystals (or exact copy)
4 tsp (level) sodium carbonate
1/4 tsp ascorbic acid
water to make 8 ounces (for one roll of 35 mm)
With no silver solvent, expect very high acutance; long development with low agitation helps the film speed and controls contrast. Grain of these films is so fine that the lack of solvent action is inconsequential.