These are just opinions, it took me less than 10 hours to be signed off solo on the 172 after flying an Ra-Aus Sling 2 (172 was in Hong Kong haha). It all depends on the type of aircraft you flew under RAA I think. Crazy enough I found the C152 to be reminiscent of the Sling 2, as the sling 2 was actually never originally designed to be an LSA but more of a cross country aircraft (700 KG MAUW). Anyone who flew a sling before will know what I mean by that. It doesn't feel very light, in fact there is heft to the controls on the sling.