It’s better to schedule a 45 minute writing session each day and be able to go over time on some days then schedule a 2 hour session each day and have to cut it short half the time.
So even if you can only carve out 30 minutes. Do it. If you can carve out more, great. But again, the key is to be honest with yourself. Don’t over commit and then have to let yourself down two weeks in. It’s better to schedule a 45 minute writing session each day and be able to go over time on some days then schedule a 2 hour session each day and have to cut it short half the time.