It is not a matter of quantity, it is a matter of persevering, as Paul states:
Philipp 2:12 ... work out your own salvation with fear and trembling
By the teaching of the Church and its Scripture.
What if you come up short?
If you don't persevere to the end, you will have no salvation.
What kind of God do you serve who would leave you hanging like that in regard to your salvation and would let you come up short and send you to hell for it?
If you do not persevere, it is not due to the fault of God.
To him who is able to keep you from stumbling and to present you before his glorious presence without fault and with great joy to the only God our Savior be glory, majesty, power and authority, through Jesus Christ our Lord, before all ages, now and forevermore! Amen.(Jude 1:24-25)