9 weeks.
Becky
He'll get long in the toe and may flare some, but if he's just loafing around the pasture he should be fine 'till you get back. You can get him back on his regular schedule after that.
He might make it OK at 9 weeks, particularly if he's not riding and risking pulling them so much. Mine usually go 8 weeks.
You just don't want him pulling a shoe off and taking another chunk with it.