How much time is needed before or after shabbos to say it is "שכר שבת בהבלעה" (shabbos earnings included with weekday earnings).
The Use of Escalators on Shabbos;
Using Baby Monitors on Shabbos;
Removing a Scab from One's Skin, Pulling Out a Non-bleeding Tooth, and Removing Warts, Pimples, etc. with a Utensil;