The only toner I try to economize on is gold. I use 250ml in a flat bottom try (old rubber one) to minimize the the "dead" volume for 8x10. It doesn't matter if you tone right after washing or the next day with a soak. I mix the bleach in bulk of about a liter. Lastly, MGIV doesn't bleach very quickly and the toning results are pretty subtle compared to a warm tone paper.