The phrase "prolongs itself" is correct and can be used in written English.
It can be used when referring to a situation that continues for a longer period of time than expected or desired. For example, "The project has prolonged itself, and the deadline is now two weeks later than originally anticipated."
'New horizons for secure life on the planet.' VLADIMIR V. PUTIN President, Russia The new century of the United Nations should prolong itself into a millennium of effective stability.
There would be a second, yearlong stay; and then a third one, which was meant to be the shortest but has prolonged itself indefinitely.
By the end of the decade, however, Hooker seemed to have wearied of touring and recording, and when the near-silence prolonged itself through the 1980s, most blues enthusiasts assumed he had vanished into retirement.
If we think how the thought of Merleau-Ponty might prolong itself into the 21st century, or as it protends a future, then we cannot not be struck by the fact that his philosophy does not entertain any conception whatsoever of an 'apocalyptic end of philosophy' followed by the emergence of some essentially different mode of thought.
The conflict with his father was to prolong itself for as long as the latter was alive.
The Ottoman-Russian occupation prolonged itself until 1851, while the 1849 Convention of Balta Liman awarded the Wallachian crown to Barbu Dimitrie Ştirbei.
What I did not anticipate was that this startle would prolong itself indefinitely, like an infernal gong at the base of my crotch that crashes with Bonhamesque fury and keeps on reverberating until each next peal.
So far, extended life has proven to be a healthier life, because better health in itself prolongs life.
High fetal weight may increase the risk of dystocia [ 18- 20], and it is debated whether epidural analgesia in itself prolongs labour [ 18, 21- 27].
In addition, TNF-α is a potent inducer of endogenous IL-32 expression, and IL-32 itself prolongs TNF-α production, thus inducing an important autoinflammatory loop [ 20].
