Educational reference. Measured from 102 recorded 10m bars of ES (E-mini S&P 500) on Friday, September 18, 2026.
RSI crossed above 70 4 separate times during the session, and the typical visit lasted 35 minutes. Across the whole session it sat above 70 for 32.4% of the time, between 30 and 70 for 57.8%, and below 30 for 9.8%.
| Band | Share of session | Bars | Separate visits | Median visit | Longest visit | |
|---|---|---|---|---|---|---|
| Above 70 | 32.4% | 33 | 4 | 35 min | 250 min | |
| Between 30 and 70 | 57.8% | 59 | 6 | 50 min | 240 min | |
| Below 30 | 9.8% | 10 | 3 | 30 min | 60 min |
RSI compares the size of recent gains with recent losses, so a reading above 70 says buying has dominated the last 14 bars — not that price is high. A long stay above 70 is a market trending up, which is the opposite of the reversal the word 'overbought' suggests.
Here the reading entered overbought territory 4 times, with a median stay of 35 minutes and a longest of 250. A brief excursion above 70 that resolves in minutes is noise on this timeframe. A sustained one is the signature of a trend that is still running, and selling into it is how traders get run over.