Marion, if you're trying to establish yourself as a professional piano player you'll need to practice more than once a week - unless the "pro entertainer" bit of your message is unrelated to piano playing.

Why not get an electronic piano like the Yamaha P80 - full 88 note weighted keyboard, you can practice at home with heaphones on without annoying the neighbours (if that would be a potential problem) and if you haven't tried it you wouldn't believe how realistic the sound is.

Of course there's the cost, but if you want to be a pro player you need to invest in your business and you might need to take it with you to gigs anyway - safer to have an instrument you know.

Anahata