clock sth up
phrasal verb with clock verb [ I ] uk/klɒk/ us
UK informal to collect or achieve a large number of similar things:
Most store cards are just about the worst way shoppers can clock up debts.
In a couple of months she will clock up a year's employment and will be able to take up the company's pension deal.
Motorists who clock up more than 15,000 miles a year are more likely to be caught speeding because of the huge number of speed cameras around.