How much Honey Malt to sweeten recipe a bit?

[Jimbodaman]

How much honey malt to sweeten up a recipe a moderate amount.
Recipe is as follows
5.5 gal into carboy

12 lb Maris Otter
1 lb Crystal 80
0.5 lb Chocholate Malt

Mash 156 F for 1 hour
1 oz northdown 60 min
2 oz saaz 10 min
.
.
.
I have no idea how much honey malt to add. What's a good "middle of the road"? I don't want it to be cloying or over sweet, but I want to notice it. I was thinking 0.25 lb... ? Thanks a ton for any help.

 

[Ebtide]

8 oz's and I have used as much as a lb in honey wheats.

 

[JimRausch]

I would be a little more cautious than Edtide.
4oz. for a nice touch, and no more than 8oz. or IMO it'll be too cloying.
I have used 1 lb. in a Graf, but that was steeped to counteract the expected dryness and tartness of the completed cider.