積年累月

year in, year out (idiom) / (over) many years

surname Nian

year / CL:個|个[ge4]

grain / harvest (old) / variant of 年[nian2]

moon / month / monthly / CL:個|个[ge4],輪|轮[lun2]

to accumulate / to involve or implicate (Taiwan pr. [lei4]) / continuous / repeated

tired / weary / to strain / to wear out / to work hard

surname Lei

rope / to bind together / to twist around

to amass / to accumulate / to store / measured quantity (such as area of volume) / product (the result of multiplication) / to integrate (math.) / to solve (or integrate) an ordinary differential equation (math.) / old / long-standing

for a long time / over many years / old / advanced in age