| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [noun pl] at a time | 96 |
|
| 2 | for [noun pl] at a time | 67 |
|
| 3 | for [noun pl] at a time | 67 |
|
| 4 | of [noun pl] at a time | 21 |
|
| 5 | of [noun pl] at a time | 21 |
|
| 6 | [prep] months at a time | 16 |
|
| 7 | [prep] hours at a time | 15 |
|
| 8 | [prep] days at a time | 14 |
|
| 9 | [prep] weeks at a time | 13 |
|
| 10 | [prep] years at a time | 6 |
|
