Here's a technique to kick you into writing
Set a timer for 15 minutes and write about yesterday. You can write what happened hour by hour, you can write as if you're telling a friend or you can choose one incident and concentrate on that.
When the timer buzzes, stop even if it is mid sentence.
Count how many words you’ve written, multiply by 4 and you have a measure of your writing speed per hour. If you can write 100 words in 15 minutes that equals 400 an hour. There's no right or wrong figure because we all work at different speeds.