How much dextrose for 12oz bottles?

Hello! I am a beginner brewer and I am working on a second batch that if Im lucky, should taste like an ipa. My question to you is, how much dextrose(corn sugar) should i put into individual 12 oz bottles? I know it is better to distribute the sugar first and then bottle, but I only have 2 gallons and lack equipment. is it okay to simply just put the dextrose right into the bottle? Also, how long should I wait before opening? My first batch, I used table sugar and waited 2 weeks and it came out fine, but I heard that with dextrose it is ready sooner. Thanks for the help!

I believe it's 1/2 tsp per 12 oz bottle, but would have to double check.

Also, everyone will tell you to wait 3 - 4 weeks or more. Up to you though if you want to check earlier.