m getting a few coins tomorrow and usually i have time to transfer and buy everything as quickly as possible, but tomorrow i'm going to have to be somewhere for a few hours right after i purchase some coins. so my question is will my coins be safe for about 5 hours in a blockchain wallet?
If you are going to use a wallet store it on your computer and use Electrum.
https://electrum.org/#home
Any wallet that is not on your computer, you do not have complete control of.