いつでも事務所にいらしてください。
tbd
Drop by my office any time.
Come to my office any time.
Please come to our offices any time.
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いつでも， なんどきでも， 何時でも
1. always, all the time, at all times
2. (at) any time, whenever (you like)
tbd
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd