As much as the soul can bear.

"Allah [SwT] holds the promise that burden on soul equals bearing capacity, in other words burden is proportional to bearing capacity"

‘’On no soul doth Allah place a burden greater than it can bear. It gets every good that it earns, and it suffers every ill that it earns. (Pray) ‘’Our Lord! Condemn us not if we forget and fall in error; Our Lord! Lay not on us a burden like that which didst lay on those before us, Our Lord! Lay not on us a burden greater than we have strength to bear. Blot out our sins, and grant us forgiveness. Have mercy on us. Thou art our Protector; help us against those who stand against Faith’’ [2:286]

The concluding ‘Ayat’ of Surah Al-Baqarah [The Cow] holds the promise and the Surah ends with a prayer. While as the promise holds that burden on soul shall be proportional to what it can bear, the promise is not without bindings. It entails earning the favour. It gets every good that it earns. The contrary is also true—it suffers every ill that it earns.

The prayer is all abiding as it does not concern solely the last verse, but as per authorities on Holy Quran wraps up the whole argument of the biggest Surah of Al-Quran—Al Baqarah. The Surah relates fact about preceding Ummah’s such as Beni Israel.
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The payer gets intense as Almighty Allah [SwT]’s favour is sought not to lay on us the burdens, with which you tested ones before us. It is prayer for lightening the burden as we may not be up to fulfilling all that is required to stay abreast with Allah [SwT]’s favours.
.The intensity of the prayer heightens with the plea to blot our sins and grant forgiveness, as also a plea to be our protector and provide help against those, who stand against faith.