You have to work there either a year full time or have 1040 hours part-time. Once you have met the hourly requirement and been accepted to pharmacy school, Walgreens will then reimburse the student $3000 for "pre-pharmacy" courses. If you participate in the program you must remain employed with walgreens as a full-time pharmacist for two years after graduating.
Then they have another program where after your first year of pharmacy school the will give you $1500, after the second year $2000, after 3rd $2500 and $3000 for your finally year. So in the end you get $12,000 and they will have a Full-time pharmacist for 6 years (2 years for the pre-pharmacy reimbursment and 4 year for each year that you take the money that is offered)
It sounds like a pretty good deal, but you would think, if there is such a pharmacist shortage then the companies (Walgreens, CVS, Target etc...) would be throwing out some deals (i.e. money) for pharmacy students to come work for them after graduation.