Even if only for 15 or 20 minutes at first, but preferably for 30-60 minutes.

即使最开始只有15到20分钟，当然最好是30-60分钟。

youdao

I can meet you at any time tomorrow, but preferably not before 11 o 'clock in the morning.

我明天什么时候见你都行，但最好是上午11点以后。

youdao

With or without an actual hypnotic induction (but preferably after one), slowly repeat the following suggestions to yourself.

不管你有没有一个实际催眠的程序（但也要遵循步骤）慢慢重复以下步骤。

youdao

To achieve these goals, you really need limitless time or oodles of money, but preferably both.

FORBES: Is Art An Asset Or An Investment?

G14 wants the format change in place by 2009 at the latest - but preferably for the start of the 2008 season.

BBC: SPORT | Football | Europe | G14 eyes Champions League changes

You need to keep an absolutely accurate note of everything you spend for a period of at least a week, but preferably a month.

BBC: Pile of coins