The spots of foam bursting through the tape are where I had to cut so I could get the nozzle right through the whole thing. It wound up taking the whole can.
Once I'd filled it, I stuck a cardboard tube (from gift wrap) down it, to make a bit of a gap down the length of the leg. Expanding foam needs air circulation to cure properly, so I thought it might be a good idea to create a void (I didn't leave the tube in there). The foam fully hardened in around 24 hours.
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