Once you have reported rent we report this soon after. The first payment takes around eight weeks to appear on your Experian and Equifax free statutory reports, then monthly thereafter. In the same way that homeowners see their mortgage payments recorded on their credit report, your rental payment data will be captured the same way.
Due to standard data quality checking and processing times with Experian and Equifax there is no way for us to speed this up currently. Should there be advance in this space we will be the first to adopt them.
With an average of 39% of income being spent on rent (English Housing Survey), you want this to be recorded on your credit file. Make sure you pay on time and your credit history should improve over time.