ICC playing conditions deem that a minimum of 90 overs must be bowled per day during a five-day Test, so play will be extended for an extra 30 minutes to accommodate the additional eight overs. A first-innings lead of 150 will be enough to enforce the follow-on in the day-night fixture in Port Elizabeth, 50 runs less than the runs needed in the five-day format.In four-day Tests:
Six and a half hours each day ✅ Minimum 98 overs per day ✅ 150 as the follow-on mark ✅https://t.co/9JACaf2GrO— ESPNcricinfo (@ESPNcricinfo) December 13, 2017
Test matches, the game's oldest format, have witnessed a steady decline in attendances in recent years, throwing the door open to a number of novel means to engage fans, including the introduction of day-night Tests. The format has come in for stiff competition from the game's newer, shorter formats, such as T20Is and domestic leagues across the globe. Officials and former players have acknowledged the need to make tests four-day affairs instead of five, hoping it would help them become more viewer friendly.Playing conditions for the #SAvZim Test: 6.5 hrs per day of 98 overs, follow-on 150. https://t.co/LW1KFwzeyr
— Rick Eyre on cricket (@rickeyrecricket) December 13, 2017