Oil Painting Time by Size

Oil painting time estimate by canvas size

Oil is a slow medium that builds up in layers. Plan on something like 30 h to 100 h of actual brush time for a mid-sized canvas around 50×70 cm, and that work tends to stretch across weeks or months. To ballpark it, the formula tracks surface area and how many layers you stack: t ≈ A(m²) × layers × rate. For detailed work the rate lands somewhere around 20–40 h/m² per layer. Then you wait. Each layer needs 3–15 days before it's touch-dry, and that window shifts with the pigment, the oil binder, and how humid the room is.

Your technique changes everything here. Paint alla prima (wet-on-wet) and you can wrap up in one sitting of 4–8 h. Go the classical glazing route and you're stacking 7–10 translucent passes. That's roughly what Rembrandt did in his portraits, and Vermeer would spend weeks on canvases smaller than 50 cm. Hold off on the final varnish until 6–12 months have passed, because that's how long the linseed oil takes to finish polymerising. Once it does, the film stops shifting when the temperature changes.

Applications

This comes in handy when you're quoting a commission, blocking out atelier time, or working backward from a gallery deadline. Places like Atelier Le Tallec or the Florence Academy of Art schedule canvases in month-long chunks. Freelancers selling on Etsy or Saatchi Art lean on the estimate to set an hourly price. Restoration teams at MASP and the Pinacoteca de São Paulo run comparable tables when they budget inpainting on Old Master oils.

FAQ

Why does drying take so long? Oil paint doesn't evaporate the way watercolor does. It oxidises instead. The linseed and walnut oils react with oxygen in the air and slowly knit into a polymer network, which is why you wait days between layers and up to a year for a full cure.

Can I speed it up with alkyd medium? You can. Mediums like Liquin or Galkyd bring the wait between layers down to about 24 h. The trade-off is that they change the gloss and tend to yellow differently from pure linseed.

Is alla prima less durable than glazing? Not on its own. Sargent and Sorolla left us alla prima masterpieces that have held up for a century. What actually keeps a painting sound is following the fat-over-lean rule and varnishing it properly, not how many layers you piled on.