Firstly, both the Su-30MKI and MiG-29B-12 were originally designed and certified to log in no more than 120 flight-hours per annum. Despite this, the IAF has been following Western standards of flight operations by requiring its air warriors to log in at least 25 flight-hours per month, or about 275 flight-hours every year, or 2,750 hours in a decade.
Now, if 275 flight-hours are logged in by a Su-30MKI, then within five-and-a-half-years itself it would have reached its scheduled time-between-overhauls (TBO) of 1,500 hours for both the airframe and turbofans, while the prescribed Russian timetables call for the Su-30MKI to approach its TBO after only a decade, i.e. after the Su-30MKI has been flown for 120 hours every year for at least a decade