1ml is enormous.. 1 cm^3... that's like the amount of paste used in marketing. Volume of a pea is more like 0.2ml so you're off by a factor of 5.
145ml is 725 portions, or 362 days worth for one person (two brushings)... approximately a year. 24 tubes = 12 years for 2 people, or 6 months for 48 people.