Alex555 wrote:Would it be faster to cover the copper side of a single-sided board with masking tape, then apply the current from the backside? That way you do not add material where there is already copper, and all of the current will be through the holes. You might have to be careful with the initial current through the graphite, though.
This would decrease the amount of current needed (although if you only have a single side of copper there's no need to cover the other side in tape (or to do PTH at all for that matter).
The total plating time wouldn't be changed though, it would still take the same amount of time to deposite the desired amount of copper onto the PTH's if you're using the same current density (amps per area).
I can't immediately think of a reason you'd want to bother with PTH on a single sided board, physical connection strength maybe?