Ask HN: What's a simple way to schedule my work?

I'm a creative freelancer, and I tend to do two x 3 hour sessions of work each day. At the moment I just create a 3 hour event in the morning and name it 'Client X' and another in the afternoon called 'Client Y'. I'm just finding it to be a clunky way of scheduling my time. I've tried services like Cushion and Harvest Forecast before, and both were good but overkill for what I need (way more features i'm paying for that I don't want to use).

So is there a simple app / way to just schedule two 3 hour sessions for myself each week day, easily fill in which client I will work on in each session, and sync with Google Calendar?

I've searched around a lot but haven't found anything. Hoping maybe there's something I haven't thought to search for.