I need to transfer some bitcoins from one site to another site.
will the new bitcoin wallet take 3 days to synch?
although my 'old' bitcoin wallet has that message saying it is obsolete,
it worked fine to transfer some coins a few days ago.
Do you think it will work ok to transfer some coins first,
and then I will download the new bitcoin wallet?
Or should I download the new wallet, wait to transfer my bitcoins, and wait for 3 days for the new wallet to synch?
While it should be fine to send Bitcoin somewhere, it is not recommended. It should not take 3 days to sync unless your wallet is currently not synced. The new installation does not delete the directory where the blockchain is stored so once installed, it will be fully synced. You should however back up your wallet just in case. If you go to the data directory, copy the wallet file to a safe location while you install and copy it back when the installation is done. The data directory can be found by typing
into the bar at the top of windows explorer. The wallet file is named wallet.dat