| 100% | ROUGHPATCH | 10 | Time period that's not easy |
| 59% | ERA | 3 | Time period that's often given a name |
| 58% | LULL | 4 | Period that's not bustling with activity |
| 57% | SEVERETEST | 10 | Trial that's not easy |
| 57% | TOUGHFIGHT | 10 | Battle that's not easy |
| 57% | HARDCHOICE | 10 | Decision that's not easy |
| 56% | SMOKERING | 9 | Something that's not easy to blow |
| 54% | ERA | 3 | Time period that's often the savior of many crossword constructors (as in this instance) |
| 53% | ERA | 3 | Time period that is notable |
| 53% | GOODOLDDAYS | 11 | Time period that inspires nostalgia |
| 51% | DEVONIAN | 8 | Time period that followed the Silurian period |
| 51% | ERA | 3 | Time period that may have a name |
| 51% | FASHIONABLYLATE | 15 | Not on time, but that's OK |
| 50% | SPACEAGE | 8 | Time period that began with Sputnik in 1957 |
| 50% | ERA | 3 | Time period that may span decades or centuries |
| 50% | EON | 3 | Time period that can last millions of years |
| 50% | ETE | 3 | Time period that the third film of Eric Rohmer's "Contes des quatre saisons" takes place (1996) |
| 50% | HRS | 3 | Time periods that are 60 minutes long: Abbr. |
| 50% | ESSAYTEST | 9 | Something that’s not quite as easy as A, B, C? |
| 50% | AMPM | 4 | Toggle that's not necessary for those on military time |
| 50% | EASTERN | 7 | US time zone that's not Pacific, Mountain, or Central |
| 49% | ERA | 3 | Time period that may be named for a president |
| 49% | AGE | 3 | Time period that can follow "Ice," "Stone," or "Bronze" |
| 49% | AGE | 3 | Time period that can follow "Ice," "Stone" or "Bronze" |
| 49% | ERA | 3 | Time period that may be named for a leader |
| 49% | ERA | 3 | Time period that may be named for a dynasty |
| 49% | ERA | 3 | Time period that may be named for a dance craze |
| 49% | ERA | 3 | Time period that may be named for a music style |
| 49% | ERA | 3 | Time period that may be named for a dance style |
| 48% | LATETAG | 7 | Infield play that’s not quite in time to get the runner out |