I wouldn't say 5 days is such a long time, the pup will have been with you about a month then? & will be around 3 months old if it's leaving at 8 weeks, i'm not really sure, it's not like the pup will be going to the kennels, so it will still have company the whole time and be treat very nicely, I think it's up to you tbh, if you think you have found the right pup then you may not want to wait incase you don't find one that suits you as much in the near future?
Good luck!
Good luck!