Mr aesgard is right on the mark, but 2 times a week will not hurt wed - Fri , Out of site out of mind!!
i usually wait a few days. all they can say is no...and they have, many times =/
daves right you have to fight for a job and bosses will want you to follow up on things if you become and employee
Never assume. Give them a call. Bug 'em.
2 days, if they really want you they will be like stink on ****