| 100% | ERA | 3 | Prohibition ___ (period when alcohol was banned) |
| 77% | ERA | 3 | Prohibition ___ (period when alcohol was illegal) |
| 55% | ERA | 3 | Prohibition ___ (when alcohol was illegal) |
| 53% | JURASSIC | 8 | Period when there were dinosaurs |
| 52% | FLAMBE | 6 | When alcohol is added to a hot pan to cook |
| 52% | ICEAGE | 6 | Period when Long Island was formed |
| 52% | UPTIME | 6 | Period when a computer is functioning |
| 52% | MEADDECADE | 10 | Period when honeyed drinks were popular? |
| 52% | OFFSEASON | 9 | Period when resorts' rates are lowest |
| 52% | SALES | 5 | Periods when store prices are reduced |
| 52% | WETSEASONS | 10 | Periods when 31-Down is abundant |
| 51% | WRECKAGE | 8 | Period when every car was a junker? |
| 51% | DEADBALLERA | 11 | Period when few home runs were hit |
| 51% | OUTAGE | 6 | Period when the power is not on |
| 50% | DOWNTIME | 8 | Period when a computer is offline or unavailable |
| 49% | TWILIGHT | 8 | Period when day is ending and night is beginning |
| 49% | EQUINOX | 7 | Period when day and night are of equal length |
| 49% | SILENTERA | 9 | Period when movie stars were seen but not heard |
| 49% | HAPPYHOUR | 9 | Promotional period when cheap drinks are offered |
| 49% | YOUTH | 5 | Time period when a person is young |
| 48% | HARVEST | 7 | Time period when crops are collected |
| 47% | ENDDATE | 7 | When a given time period is over |
| 46% | IRONAGE | 7 | *Toolmaking period when bronze was replaced with steel |
| 44% | LUNCHTIME | 9 | Period of the day when the midday meal is eaten |
| 42% | ETERNITY | 8 | Period you always appear to be waiting for when you phone tech support |
| 41% | OPPOSITEDAY | 11 | Period when everything is backwards ... and where the starts of 20-, 27- and 45-Across might be found? |
| 41% | PAYDAY | 6 | Period of month when wages are given |
| 41% | SAD | 3 | Term for depressive periods when sunset happens at 4 pm and dawn appears at 9 am |
| 38% | ERA | 3 | Big Band ___ (period when Benny Goodman was popular) |
| 38% | BOOM | 4 | Baby ___ (period when many children are being born) |