Absolutely not, never, ever. Even if the client asked me to bill extra hours I didn't work, I wouldn't. In your colleagues parallel universe, I wonder if he/sh

Absolutely not, never, ever. Even if the client asked me to bill extra hours I didn't work, I wouldn't. In your colleagues parallel universe, I wonder if he/she would be OK with clients paying what they estimated the hours it took or should have taken? My own rule of thumb is I charge the client for time that that I couldn't work for someone else. Example: Travel time. I also charge them even for "stupid mistakes". They wouldn't dock the pay of their own employees for a mistake after all.