Mornings 7-30-ish, a 260 express ought to be able to get you to Admiralty in 20-30 min. (After a.m. meetings at HKIS South Bay Close I've done it 5-6 times even at 8 without too much pain). Likewise on return if you work late as many in HK do - like 8pm. Or if you get out of Admiralty by 5-45 or so before the traffic soup gathers on Gloucester Rd.
Though I live halfway to Stanley and 260 isn't my route, from the few occasions I've tried to leave "early" and take the shuttle or public buses (even cabs) homewards, I know 6-15 onwards is a nightmare on Gloucester Rd or Queens Rd E - may as well sit it out till at least 7 at work or something else.
If your work permits flexi-hours, doing a 7-30 - 5/5-45 may be good options. Otherwise, with traditional 9-6, happy gprs browsing (or linguaphone or self-improvement tapes)!
P.S. another factor: road repairs on Repulse Bay Road - on that, better let someone who lives that side reply with more current info. Was a major factor 6 yrs back in our decision to live short of that otherwise picturesque road (line-ups even worse mid-morning till afternoon on week-ends).