The phrase "has been continuing for" is correct and usable in written English.
This phrase is typically used in the present perfect continuous tense to indicate that an activity has been happening continuously up to the present time. For example, "The rain has been continuing for days and there's no end in sight."
Ministers have also been told the US appears to have been stockpiling fuel and other defence equipment at its bases in the Gulf, in a slow and discreet build-up that has been continuing for up to a year.
Perhaps the ugliest manifestation of the current climate can be found at the Palm Beach County Emergency Operations Center, where a manual recount of that county's votes has been continuing for days.
The Supreme Court however a recent European court judgment had left UK judges "in no doubt as the seriousness of the breach, which has been continuing for more than five years, nor as to the responsibility on the national court to secure compliance".
The first wavelet of New Yorkers, many of them gays, had begun buying beat-up beach houses to rehab as second homes, a pattern of improvement that has been continuing for about five years now, according to local real estate agents.
Although EM exploration has been continuing for over 70 years, it is still fairly far from covering the whole globe.
Bangladesh and India share nearly fifty-four rincludingluding the Ganges and Brahmaputra and disputes over water sharing of those rivers has been continuing for more than half a century.
Long-term follow-up of these people has been continued for 24 years.
After an additional surgery, nilotinib administration has been continued for 21 months, with no evidence of recurrence.
The effort to pursue effective anti-cancer drugs with novel mechanism of action has been continued for decades.
The study of geography by extracting the places from text based documents, records or any other historical resources is not a new phenomenon but has been continued for a long time (Sharp 1904; Woolf 1977).
The Finnish high-voltage power grid and the Finnish natural gas pipeline have not encountered GIC harm but due to the high-latitude location of the country and to a general interest in phenomena in the auroral region, an active research of the occurrence of GIC in these systems has been continued for about twenty years.
