some time—
1. at some future time:
- Rehearsals have already started and the record is expected to be released some time in the autumn.
2. for a period of time:
- There is a class of women who take lodgings, and after staying some time run away without paying their rent.
sometime—
1. = some time 1:
- I almost forgot to say that the museum is slated for an opening sometime in the autumn.
2. (attrib.) former:
- He is a man of peace, which goes well with a sometime secretary of defense.