Analysis of information sources in references of the Wikipedia article "宇宙機の推進方法" in Japanese language version.
| ミリ秒(milliseconds) | 1 E-3 s - 1 E-1 s |
| 秒(seconds) | 1 E-1 s - 1 E1 s |
| 分(seconds) | 1 E0 s - 1 E2 s |
| 30分(half hour) | 1 E3 s |
| 時間(hours) | 1 E3 s - 1 E4 s |
| 日(days) | 1 E4 s - 1 E5 s |
| 週(seconds) | 1 E5 s |
| 数日(several days) | 1 E5 s |
| 月(months) | 1 E6 s |
| 年(years) | 1 E6 s - 1 E7 s |
| 数年(decades) | 1 E8 s |
