For a time-released product maybe. But NOT for the usual cyanocobalabin you buy in pharmacy!
You should be fine doing 1000 ug (1 amp for most brands) a day. Or split in two daily doses if you prefer. But honestly, I don't think the 2nd inject would be worth the time lost
Cyanacobalamin (99% of brands out there) has to be injected daily.
Hydroxycoibalamin can be injected once a week, or as it says in that article, every 6 days.
Synthelamin from www.synthetek.com contains 800mcg of cyanacobalamin and 1,200mcg of hydroxycobalamin (2,000mcg/ml - double of any other brand) so you get a sustained timed release - kind of like sustanon.