[tzs]

If it takes 5 minutes to learn, and if you have 30 more years of needing to tie drawstrings, and you need to tie on average one drawstring per week, you will come out ahead if it saves you 0.19 seconds tying or retying per drawstring.

[____tom____]

Ah, but are you remembering to discount the future time saving, to get the net present value of the time savings?