Well, marginally do-able in a very long day (while there is lots of daylight) but, more reasonably, an overnighter for the furthest-north hike that I could recommend from experience... e.g. 4 hours to the Mosquito Creek hostel (for those who like that sort of thing - we stayed there once in winter - neat place!), then backtrack in the morning to the Helen Lake trailhead at Bow Lake...
We have all the hiking guides... I'll browse around a bit.